Cây trồng cần lên luống là: A. rau khoai lang, lúa. B. rau cải cúc, lúa. C. rau cải cúc, rau khoai lang. D. lúa, ngô.

What does the doctor recommend to eat?

What do happy people do? 

What kind of food will help people to keep fit and stay healthy?