A) The pollution of the environment has given rise to many serious social problems. B) He left very early for fear of missing th

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问题 A) The pollution of the environment has given rise to many serious social problems.
B) He left very early for fear of missing the train.
C) You are liable to get sick if you do not do physical exercise often.
D) Theories are meaningless unless they are applied to practice.
他担心会误了火车,所以早早就出发了。

选项 A、 
B、 
C、 
D、 

答案B

解析
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