Plastic bags won’t be allowed to be used for free in the supermarkets. They can’t easily, which does great harm to our environment.
A. break off
B. break in
C. break down
D. break out
网友回答
A. break off
B. break in
(答案→)C. break down
D. break out
解析：考查短语辨析。break off 中断，break in 插嘴，break down 分解，break out 发生，句意：塑料袋不允许在超市免费使用。它们不容易分解，对我们的环境有害。所以选C。