第13题: [单项选择]Questions 11 to 18 are based on the conversation you have just heard.[A] The door needs repairing. [C] He couldn’t open the door. [B] He bad lost all his keys. [D] He wanted the woman to help him. 参考答案:C 答案解析:[听力原文] W: Why are you just standing outside instead of going in M: I have tried all my keys i
A. varied B. variant C. variable D. various 参考答案:D 答案解析:本题的大意是空气是由氢气、氧气和二氧化碳等各种各样的气体组成的。四个选项中,varied多变化的,多用于修饰可数名词:variant不同的,变异的,多用作名词,variable易变的,反复不定的,va