D．Military technology has great potential in civilian use.

　　解析：选D。通读全文可知，军事技术在民用方面有巨大潜能。

　　8．What's the passage chiefly about?

　　A．An effort to protect an endangered marine species.

　　B．The civilian use of a military detecting system.

　　C．The exposure of a US Navy top­secret weapon.

　　D．A new way to look into the behavior of blue whales.

　　解析：选B。通读作文可知，本文主要介绍了一种军事探测系统在民用方面的作用。

　　Ⅳ.短文改错

　　During the weekend I traveled by air the first time in my life.I generally travel by train and bus.It is both cheaper and safe.But this was a short journey.In the beginning I did not feel very happily, but this feeling did not last longer.The journey was very exciting.I was soon high up in the sky among the cloud.The views of mountains, fields and rivers were interested.I enjoy my short and comfortable journey very much.This experience has shown that traveling in air is actually the safest way of make journeys.

　　答案：第一句：在第二个the前加for

　　第二句：and→or

　　第三句：safe→safer

　　第五句：happily→happy；longer→long

　　第七句：cloud→clouds

　　第八句：interested→interesting

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