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第18题： Which of the following sentences is true?

A. In the 1960s, computer networks worked wellB. In the early 1970s, the Internet was easy to use.C. Sending e-mails is more popular among students than before.D. Today it is still not easy to get on-line. 【正确答案】C

讲解：【解析】第二段第二行可知A选项错误。第二段倒数第四行可知B项错误。第三段可知D项错误，C项正确。

第19题：A. lend B. read C. learn D. write

【正确答案】B

讲解：读书用动词read ，为固定搭配，故选B

第20题：All the watches ____ by the end of next week.

A.have repaired B.will have repaired C.had been repaired D. will have been repaired 【正确答案】D

讲解：【解析】 by the end of next week是将来完成时的标志。表示在将来某个时间之前势必要完成的动作。结构是will+have +pp（过去分词）