Unit 2 No smoking, Please!

典型例题

1．The population of this city, forty percent of which ______15% in the last three years.
　　A. are Germans; has risen by
　　B. are Germen; has fallen by
　　C. is Germans; have increased to
　　D. are Germans; have been reduced by
分析：本题旨在考查本单元的词汇population的用法以及主谓一致。population强调人口是多少时，若作主语，谓语动词用单数形式。population强调人口的身份或特征，若后面作表语的名词是复数时，谓语动词则要用复数形式。据题意，第一空中Germans 用复数，则谓语动词用复数，Ｂ、Ｃ两项可排除，而the population of this city强调人口，谓语动词需用单数，故本题最佳答案为Ａ。

2．You will be late ______ you leave immediately.
　　A. unless 　　B. until　　 C. if 　　D. or
解析：本题考查连词的用法。unless"除非......"，与本题中"除非立刻就去，不然你会迟到的"意义相符。而until"直到......才......"常表示延续动作或状态直到某时结束。or表示"或者""否则"，如选D，原题应为leave immediately, or you will be late,这属于另一种句型。故选A。

3．______ him and then try to copy what he does.
　　A. Mind B. Glance at C. Stare at D. Watch
解析：本题考查动词的辨析。本句句意是"先仔细观察，然后照他那样去做"。mind"介意，在乎"，glance at"粗略的看(一下)",stare at "盯着、凝视",watch"观察、观赏"，因而不难选出答案。答案选D。

4．I can hardly hear the radio, would you please _____?
　　A. turn it on 　　B. turn it down
　　C. turn it up　　　D. turn it off
解析：本题考查动词词组的辨义。题中的信息是"收音机声音太低，听不清楚"，故可知应"调大音量"，A项为"打开"，B项为"把......调低"，C项为"把......调高"，D项为"关闭"。故选C。

5．The boy wanted to ride his bicycle in the street, but his mother told him______.
　　A. not to 　　B. not to do
　　C. not do it 　D. do not to
解析：本题考查不定式作宾补的用法，事实上是直接引语转为间接引语的用法。本题理解为The boy's mother said "Don't ride in the street",转为间接引语后为：The boy's mother told him not to ride in the street. 然后再根据英语中避免重复的原则；将前面出现的ride in the street省略，选出答案A。