Choose the words that have the different stress from the others. 1. A. definition B. electricity C. contaminate D. radiation 2. A. dramatic B. overhead C. century D. groundwater 3. A. thermal B. beneath C. rubbish D. earplug 4. A. affect B. billboard C. visual D. substance 5. A. aquatic B. behavior C. pollution D. permanent Giúp mình với