题目内容
16．You can't borrow books from the school library ______ you get your student card．（ ）| A． | before | B． | if | C． | while | D． | as |
分析 在你拿到你的学生卡之前你不能从学校图书馆借书．
解答 答案：A
before之前；if如果；while当…时候；as因为，作为；句意表达的是你拿到学生卡后才能借书，要用before来构成．故选A．
点评 本题考查时间状语从句，before表示在…之后，…才…，是比较重要的用法．
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Only 65 percent of nonsmokers and 43 percent of smokers answered yes．
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| 42．A．later | B．latest | C．latter | D．previous |
| 43．A．but | B．and | C．however | D．or |
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| 45．A．break up | B．break down | C．wind up | D．wind down |
| 46．A．cars | B．seats | C．kids | D．windows |
| 47．A．visible | B．invisible | C．poisonous | D．concrete |
| 48．A．policies | B．attitudes | C．bans | D．habits |
| 49．A．told | B．content | C．confident | D．aware |
| 50．A．opposed | B．agreed | C．fought | D．connected |
| 51．A．harm | B．destroy | C．improve | D．confuse |
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