7. A. called B. stopped C .seen D. joined
[解析]“我妻子也加入进来……”。join sb. 加入到某人的行列中；和某人一起…。答案：D
8.A.It B. nothing C .lift D .help
[解析]“在告诉她救助就要来之后，……”。on the/one’s way, 即将到来 答案：D
9.A.lift B. door C. flat D. way 答案：C
10. A. down B. up C. on D. from
[解析]“我”从家里赶快返回电梯，从前文我们得知此时电梯在several flights below, 因此I hurried down the stairs . 答案：A
11.A.that B. where C. which D. there
[解析] where引导定语从句修饰place, where在句中作状语。答案：B
12. A. open B. close C. shut D. turned
[解析]电梯的门一直紧闭，“我”想撬开门。force to do sth. 强行做某事。答案：A
13.A.though B. if C . but D. because 答案：C
14. A. quickly B. fast C .well D .soon
[解析]A、B也都可以表示“快”但quickly多侧重行动的敏捷，而fast指速度快，在此作者指不大会儿工夫，“我”妻子回来了，因此用soon一词。 答案：D
15. A. Able B. Unable C. Glad D. Sony
[解析]从she had called the police, …看，“我”妻子没有找到值班人.答案：B
16. A. Besides B. Instead C. Still D. But
[解析]besides在此为副词，意思是“另外”。 答案：A
17. A. porters B. men C. policemen D. firemen
[解析]她没有找到值班人，因此A不合题意。从空后的almost immediately afterwards the firemen 18 (arrived) too. 得知D也不合题意。 答案：C
18. A. reached B. arrived C. got D. left
[解析]A,C都可以表示到达，但reach当“到达”解时是及物动词，get to + n. 或get后直接跟副词才可表示“到达”。答案：B
19. A. spent B. took C. passed D. stayed
[解析]It took sb. some time to do sth. 花某人一段时间做某事。spend也可表示“花费”，但其主语是人而不是it或物。 答案：B
20. A. spirits B. health C. conditions D. manners
[解析]“尽管有这次（不愉快的经历），女孩的情绪很好。” 答案：A
探究活动
What's your opion on dealing with waste in China, or in Beijing?
What do you think about the "White Pollution"? Do you have some suggestion?