Read the following passage and choose the best answer to each question.

Water pollution is one of the biggest threats to the environment today. There are several sources of water pollution ranging from sewage and fertilizers to soil erosion. The impact of water pollution on wildlife and their natural habitat can be immense. There are also a number of things that the average person can do to help stop water pollution.

We should conserve the soil because soil conservation influences water pollution through erosion. As soil is eroded by water, it transfers sediment from the land to the body of water, which is polluted by the chemicals in the sediment. Phosphorus and industrial chemicals can be pulled into water through soil erosion. When phosphorus levels in water become too high, they can lead to algae blooms that can cause massive fish deaths and make water unsafe for human use. The best way to prevent soil erosion is to keep the banks of rivers well-covered with plants or trees. Planting trees can have a significantly positive impact on the reduction in soil erosion.

The oil used to lubricate engines in all types of machines needs to be changed regularly. When the oil is changed, it presents a number of environmental hazards if not disposed of properly. When a leaky engine releases this oil into the street, it runs to the sewer and makes its way into waterways.

Wherever you see a lot of human recreation, you will almost always see lots of evidence of human use. Wrappers, bottles and other trash are unfortunately a common site at many well-used beaches and rivers around the world. It should be fairly obvious that the trash from these places often ends up in waterways and can cause pollution. Plastics are an especially big issue when it comes to water contamination at beaches and waterways. Picking up litter wherever you find it is honestly the best, fastest way to do your part to stop this type of water pollution.

Organize cleaning parties with local people to make the reach larger. Get businesses involved as sponsors who will donate prizes to the person who collects the most trash if you're having a hard time finding people to sign up to help.

It is estimated that the consumption of plastic by humans is between 250 and 300 million tons a year. About 80% of the plastic in the oceans came from the land. Using alternatives to plastics or using "less disposable" plastics whenever possible can have a surprising impact on ocean pollution. The fact that plastic is cheap and useful for different purposes makes it obvious choices for many people.

Lubricants can cause environmental hazards when _______.

Read the following passage and choose the best answer to each question.

As most potential ecotourist sites are inhabited by ethnic minorities, the principle of “encouraging community participation in ecotourism activities” should both create income and help maintain cultural identity. These communities have a deep understanding of traditional festivals, cultivation and land use customs, traditional lifestyle and handicrafts, and historical places. A trip to the limestone mountain of Cao Bang - Bac Kan, for example, is valuable not only for the Ba Be Lake, but for the opportunity to learn about cultivation customs, dying practices using endemic plants to produce brocading, and traditional handmade boats of precious timber collected in the forest.

Because ecotourism is important for environmental education, maintenance of indigenous culture, and local economic development, both investment and government encouragement are required.

One research shows that 90 percent of ecotourist guides lack environmental knowledge about the flora, fauna, and natural resources in the area, and 88 percent would benefit from ecotourism guidebooks written especially for them. An illustration of wasted potential caused by this lack of training is Ha Long Bay, a world heritage site with immense environmental value - coral reefs, limestone mountains, thousands of flora and fauna species of high biodiversity, and rich cultural identity. But tourists in Ha Long Bay are presently visiting only the Bay and some caves, not accessing environmental information or local cultural activities. In general, the full potential of ecotourism has not yet been reached.

International visitors to Viet Nam often like to visit ethnic minority villages to observe the culture, meet local people, and participate in traditional activities. The ethnic minorities who live in or near nature reserves maintain distinctive lifestyles, cultural identities, and traditional customs. These features are part of the real value of ecotourism. However, local people are not much involved in ecotourism.

In addition, local people still live in poverty, their life closely associates with natural resources. The economic benefits of ecotourism need to be shared with them, but this will not happen without community participation.

An eco tour to the region of ethnic minorities is very valuable because tourists _______.

Read the following passage and choose the best answer to each question.

As most potential ecotourist sites are inhabited by ethnic minorities, the principle of “encouraging community participation in ecotourism activities” should both create income and help maintain cultural identity. These communities have a deep understanding of traditional festivals, cultivation and land use customs, traditional lifestyle and handicrafts, and historical places. A trip to the limestone mountain of Cao Bang - Bac Kan, for example, is valuable not only for the Ba Be Lake, but for the opportunity to learn about cultivation customs, dying practices using endemic plants to produce brocading, and traditional handmade boats of precious timber collected in the forest.

Because ecotourism is important for environmental education, maintenance of indigenous culture, and local economic development, both investment and government encouragement are required.

One research shows that 90 percent of ecotourist guides lack environmental knowledge about the flora, fauna, and natural resources in the area, and 88 percent would benefit from ecotourism guidebooks written especially for them. An illustration of wasted potential caused by this lack of training is Ha Long Bay, a world heritage site with immense environmental value - coral reefs, limestone mountains, thousands of flora and fauna species of high biodiversity, and rich cultural identity. But tourists in Ha Long Bay are presently visiting only the Bay and some caves, not accessing environmental information or local cultural activities. In general, the full potential of ecotourism has not yet been reached.

International visitors to Viet Nam often like to visit ethnic minority villages to observe the culture, meet local people, and participate in traditional activities. The ethnic minorities who live in or near nature reserves maintain distinctive lifestyles, cultural identities, and traditional customs. These features are part of the real value of ecotourism. However, local people are not much involved in ecotourism.

In addition, local people still live in poverty, their life closely associates with natural resources. The economic benefits of ecotourism need to be shared with them, but this will not happen without community participation.

Ecotourism can bring all the following benefits EXCEPT_______.

Read the following passage and choose the best answer to each question.

As most potential ecotourist sites are inhabited by ethnic minorities, the principle of “encouraging community participation in ecotourism activities” should both create income and help maintain cultural identity. These communities have a deep understanding of traditional festivals, cultivation and land use customs, traditional lifestyle and handicrafts, and historical places. A trip to the limestone mountain of Cao Bang - Bac Kan, for example, is valuable not only for the Ba Be Lake, but for the opportunity to learn about cultivation customs, dying practices using endemic plants to produce brocading, and traditional handmade boats of precious timber collected in the forest.

Because ecotourism is important for environmental education, maintenance of indigenous culture, and local economic development, both investment and government encouragement are required.

One research shows that 90 percent of ecotourist guides lack environmental knowledge about the flora, fauna, and natural resources in the area, and 88 percent would benefit from ecotourism guidebooks written especially for them. An illustration of wasted potential caused by this lack of training is Ha Long Bay, a world heritage site with immense environmental value - coral reefs, limestone mountains, thousands of flora and fauna species of high biodiversity, and rich cultural identity. But tourists in Ha Long Bay are presently visiting only the Bay and some caves, not accessing environmental information or local cultural activities. In general, the full potential of ecotourism has not yet been reached.

International visitors to Viet Nam often like to visit ethnic minority villages to observe the culture, meet local people, and participate in traditional activities. The ethnic minorities who live in or near nature reserves maintain distinctive lifestyles, cultural identities, and traditional customs. These features are part of the real value of ecotourism. However, local people are not much involved in ecotourism.

In addition, local people still live in poverty, their life closely associates with natural resources. The economic benefits of ecotourism need to be shared with them, but this will not happen without community participation.

Tourist guides who lack environmental knowledge can’t_______.

Read the following passage and choose the best answer to each question.

As most potential ecotourist sites are inhabited by ethnic minorities, the principle of “encouraging community participation in ecotourism activities” should both create income and help maintain cultural identity. These communities have a deep understanding of traditional festivals, cultivation and land use customs, traditional lifestyle and handicrafts, and historical places. A trip to the limestone mountain of Cao Bang - Bac Kan, for example, is valuable not only for the Ba Be Lake, but for the opportunity to learn about cultivation customs, dying practices using endemic plants to produce brocading, and traditional handmade boats of precious timber collected in the forest.

Because ecotourism is important for environmental education, maintenance of indigenous culture, and local economic development, both investment and government encouragement are required.

One research shows that 90 percent of ecotourist guides lack environmental knowledge about the flora, fauna, and natural resources in the area, and 88 percent would benefit from ecotourism guidebooks written especially for them. An illustration of wasted potential caused by this lack of training is Ha Long Bay, a world heritage site with immense environmental value - coral reefs, limestone mountains, thousands of flora and fauna species of high biodiversity, and rich cultural identity. But tourists in Ha Long Bay are presently visiting only the Bay and some caves, not accessing environmental information or local cultural activities. In general, the full potential of ecotourism has not yet been reached.

International visitors to Viet Nam often like to visit ethnic minority villages to observe the culture, meet local people, and participate in traditional activities. The ethnic minorities who live in or near nature reserves maintain distinctive lifestyles, cultural identities, and traditional customs. These features are part of the real value of ecotourism. However, local people are not much involved in ecotourism.

In addition, local people still live in poverty, their life closely associates with natural resources. The economic benefits of ecotourism need to be shared with them, but this will not happen without community participation.

In order to develop ecotourism, local communities should _______.

Read the following passage and choose the best answer to each question.

As most potential ecotourist sites are inhabited by ethnic minorities, the principle of “encouraging community participation in ecotourism activities” should both create income and help maintain cultural identity. These communities have a deep understanding of traditional festivals, cultivation and land use customs, traditional lifestyle and handicrafts, and historical places. A trip to the limestone mountain of Cao Bang - Bac Kan, for example, is valuable not only for the Ba Be Lake, but for the opportunity to learn about cultivation customs, dying practices using endemic plants to produce brocading, and traditional handmade boats of precious timber collected in the forest.

Because ecotourism is important for environmental education, maintenance of indigenous culture, and local economic development, both investment and government encouragement are required.

One research shows that 90 percent of ecotourist guides lack environmental knowledge about the flora, fauna, and natural resources in the area, and 88 percent would benefit from ecotourism guidebooks written especially for them. An illustration of wasted potential caused by this lack of training is Ha Long Bay, a world heritage site with immense environmental value - coral reefs, limestone mountains, thousands of flora and fauna species of high biodiversity, and rich cultural identity. But tourists in Ha Long Bay are presently visiting only the Bay and some caves, not accessing environmental information or local cultural activities. In general, the full potential of ecotourism has not yet been reached.

International visitors to Viet Nam often like to visit ethnic minority villages to observe the culture, meet local people, and participate in traditional activities. The ethnic minorities who live in or near nature reserves maintain distinctive lifestyles, cultural identities, and traditional customs. These features are part of the real value of ecotourism. However, local people are not much involved in ecotourism.

In addition, local people still live in poverty, their life closely associates with natural resources. The economic benefits of ecotourism need to be shared with them, but this will not happen without community participation.

The word “distinctive” in paragraph 4 is closest in meaning to_______.

Read the following passage and choose the best answer to each question.

Water pollution is one of the biggest threats to the environment today. There are several sources of water pollution ranging from sewage and fertilizers to soil erosion. The impact of water pollution on wildlife and their natural habitat can be immense. There are also a number of things that the average person can do to help stop water pollution.

We should conserve the soil because soil conservation influences water pollution through erosion. As soil is eroded by water, it transfers sediment from the land to the body of water, which is polluted by the chemicals in the sediment. Phosphorus and industrial chemicals can be pulled into water through soil erosion. When phosphorus levels in water become too high, they can lead to algae blooms that can cause massive fish deaths and make water unsafe for human use. The best way to prevent soil erosion is to keep the banks of rivers well-covered with plants or trees. Planting trees can have a significantly positive impact on the reduction in soil erosion.

The oil used to lubricate engines in all types of machines needs to be changed regularly. When the oil is changed, it presents a number of environmental hazards if not disposed of properly. When a leaky engine releases this oil into the street, it runs to the sewer and makes its way into waterways.

Wherever you see a lot of human recreation, you will almost always see lots of evidence of human use. Wrappers, bottles and other trash are unfortunately a common site at many well-used beaches and rivers around the world. It should be fairly obvious that the trash from these places often ends up in waterways and can cause pollution. Plastics are an especially big issue when it comes to water contamination at beaches and waterways. Picking up litter wherever you find it is honestly the best, fastest way to do your part to stop this type of water pollution.

Organize cleaning parties with local people to make the reach larger. Get businesses involved as sponsors who will donate prizes to the person who collects the most trash if you're having a hard time finding people to sign up to help.

It is estimated that the consumption of plastic by humans is between 250 and 300 million tons a year. About 80% of the plastic in the oceans came from the land. Using alternatives to plastics or using "less disposable" plastics whenever possible can have a surprising impact on ocean pollution. The fact that plastic is cheap and useful for different purposes makes it obvious choices for many people.

Soil erosion can lead to water pollution because _______.

Read the following passage and choose the best answer to each question.

Water pollution is one of the biggest threats to the environment today. There are several sources of water pollution ranging from sewage and fertilizers to soil erosion. The impact of water pollution on wildlife and their natural habitat can be immense. There are also a number of things that the average person can do to help stop water pollution.

We should conserve the soil because soil conservation influences water pollution through erosion. As soil is eroded by water, it transfers sediment from the land to the body of water, which is polluted by the chemicals in the sediment. Phosphorus and industrial chemicals can be pulled into water through soil erosion. When phosphorus levels in water become too high, they can lead to algae blooms that can cause massive fish deaths and make water unsafe for human use. The best way to prevent soil erosion is to keep the banks of rivers well-covered with plants or trees. Planting trees can have a significantly positive impact on the reduction in soil erosion.

The oil used to lubricate engines in all types of machines needs to be changed regularly. When the oil is changed, it presents a number of environmental hazards if not disposed of properly. When a leaky engine releases this oil into the street, it runs to the sewer and makes its way into waterways.

Wherever you see a lot of human recreation, you will almost always see lots of evidence of human use. Wrappers, bottles and other trash are unfortunately a common site at many well-used beaches and rivers around the world. It should be fairly obvious that the trash from these places often ends up in waterways and can cause pollution. Plastics are an especially big issue when it comes to water contamination at beaches and waterways. Picking up litter wherever you find it is honestly the best, fastest way to do your part to stop this type of water pollution.

Organize cleaning parties with local people to make the reach larger. Get businesses involved as sponsors who will donate prizes to the person who collects the most trash if you're having a hard time finding people to sign up to help.

It is estimated that the consumption of plastic by humans is between 250 and 300 million tons a year. About 80% of the plastic in the oceans came from the land. Using alternatives to plastics or using "less disposable" plastics whenever possible can have a surprising impact on ocean pollution. The fact that plastic is cheap and useful for different purposes makes it obvious choices for many people.

The following are the effects of water pollution EXCEPT that        _______.