5．What is NOT true of a CAT scan?

　　A．It is safer than regular X­rays.

　　B．It makes use of computer techniques.

　　C．It can stop the action of an organ for a short time.

　　D．It can give clear pictures of active，moving body parts.

　　解析：细节理解题。根据倒数第二段第二句话可知A项正确；根据第四段的A computer studies the information from each direction and produces a clear cross－se­ctional picture on a screen.可知B项正确；根据第四段中的The latest CAT scanners can even give clear pictures of active，moving organs，just as a fast­action camera can “stop the action”，giving clear pictures of what appears unclear to the eye.可知C项错误，D项正确，故答案为C项。

　　答案：C

　　6．The underlined words “a foreign object” (Para.3) most probably refer to ________.

　　A．a badly injured part inside the body

　　B．a new thing that is unknown to the doctor

　　C．a strange organ that has grown in the body

　　D．an object that gets inside the body by chance

　　解析：推测词义题。画线词所在处是说医生可以利用X­rays找到患者体内的异物，故此题选D项。

　　答案：D

　　7．What is the special use of the latest CAT scanners?

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