B．If so.

　　C．What if?

　　D．How come? 答案与解析：A　so what那又怎么样；if so如果这样的话；what if假如……又怎么样呢；how come怎么回事。据句意选A项。 课时检测22(Unit 22　Environmental Protection)

　　Ⅰ.单项填空 1．The suggestion that we have a group of these records printed as soon as possible ________ by the committee. A．was adopted　B．adopted C．was taken

　　D．took 答案与解析：A　adopt the suggestion意为“采纳建议”。句意：我们应将这组记录尽快打印出来的建议被组委会采纳了。 2．The computer system ________ suddenly while he was searching for information on the Internet. A．broke down

　　B．broke out C．broke up

　　D．broke in 答案与解析：A　句意：他在网上搜寻信息时，计算机系统突然坏了。break down“出故障，垮掉”，符合句意。break out爆发；break up破碎；分裂；结束；衰落；分解；break in闯入；打断；开始工作。 3．My Knight cannot be here, so his wife will accept the prize ________. A．on his behalf

　　B．on duty C．ahead of

　　D．in need 答案与解析：A　on duty值日；ahead of在……前面；in need需要。on his behalf“代替他”，符合句意。 4．We tried to finish the work before dark, but it didn't quite ________ as planned. A. go on

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