Unit 1 friendship reading课时作业

Ⅰ.单项填空(建议用时8′)

　　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

　　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。

　　答案：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

　　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。

　　答案：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

　　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。

　　答案：A

　　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

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