Giải thích 
----- Nội dung dịch tự động từ ảnh -----
estion 18. Too much carbon dioxide in the atmosphere
A. helps
stion19. If thermal pollution continues for a long time, it can
A. possible
stion20. Their children have birth defects because the parents are
A. big
tion21." How about giving a presentation about water and air pollution?"
A. No. I had no idea. B. Great idea! When should we start?
C. That sounds boring!I don't agree! D. I agree.
global warning.
B. causes
C. does
D. encourages
cause huge bacteria.
C. possibilities
smokers.
B. possibly
C. possibility
B. heavy
C. old
D. large