Unit 2 The Olympic Games reading课时作业

Ⅰ.单项填空

1．The 18th and 19th centuries ___________the widespread use of electricity and the birth of the steam engine.

A．made B．proved

C．spared D．witnessed

答案　D

解析　句意为：18、19世纪见证了电的广泛传播和蒸汽引擎的诞生。some time witness sth.某时见证某事，所以选择D。

2．A policeman put some chemicals on the piece of paper， and ______a line of words.

A．gave up B．showed up

C．made up D．stayed up

答案　B

解析　考查动词短语辨析。give up放弃；show up出现；make up弥补，化妆，编造；stay up熬夜。句意为：一个警察在纸上放了些化学药品，一行字就出现了。所以选B。

3．There are some health problems that，when_______ in time，can become bigger ones later on.

A．not treated B．not being treated

C．not to be treated D．not having been treated

答案　A

解析　句意为：有些健康问题，如果不及时处理，以后会变得更严重。When not treated in time为插入语，在本句中为时间状语从句，把that can become bigger ones later on这个定语从句给隔开了。when引导时间状语从句时，可以出现省略的现象，但必须满足两个条件：首先，时间状语从句中的主语必须和主句主语一致；其次，从句中含有be动词。本句中补充完整的状语从句为：when they are not treated in time，其他选项形式不对。故答案为A项。

4．_________ on this report，the English government decided to ask Captain James Cook to go and look for this new continent.

A．Having based B．Basing

C．Based D．To be based

答案　C

解析　考查非谓语动词。句意为：基于这份报告，英国政府决定让詹姆斯库克船长去寻找这个新大陆。be based on基于，所以选择C。

5．We all can go out for a picnic this afternoon ___________that the others agree.