第16题: [单项选择]A self-contained breathing apparatus is used to(). A. make underwater repairs to barges B. determine if the air in a tank is safe for men C. enter areas that may contain dangerous fumes or lack oxygen D. resuacitate an unconscious person 参考答案:C
第25题: [单项选择]If being carried out successfully, the plan will completely change the traffic conditions in the city. A. carried B. is carried C. having been carried D. to carry 参考答案:A 答案解析:[解析] 结构应用 本句考察的是省略的用法:当状语从句的主语和主句的主语相同时,状语从句可以用分词短语作状语。本句完整的句子应为“if it is carried out success