题目

The poor mother _____and wept when she heard the news that her five-year-old son had been kidnapped.    A. broke out           B. broke down          C. broke up                D. broke off 答案：B10．The question that puzzled them is_____ they can get rid of the air pollution in the area．（　　）A．how is it thatB．that howC．what is itD．how it is that