The

　　British

　　Medical

　　Journal

　　published

　　the research. In all, thirty­six bladder cancer patients and one hundred and eight other people took part. During training，all the dogs reportedly even identified (识别) a cancer in a person who had been tested healthy before the study. Doctors found a growth on the person's right kidney (肾). Carolyn Willis said dogs could help scientists identify the compounds produced by bladder cancer. That information

　　could

　　then

　　be

　　used

　　to

　　develop machines to test for the chemicals. Now, doctors must remove tissue (组织) from the bladder to test for cancer. The team also plans to use dogs to help identify markers for other kinds of cancer.

　　46．Dogs can find all the following except ________ according to the passage.

　　A．a lost child

　　B．illegal drugs

　　C．bladder cancer

　　D．lung cancer

　　答案：D　从文章第一段可知，狗能发现走失的人和毒品，现在的研究又表明狗能发现膀胱癌，但研究还没有表明狗能发现其他癌症。

　　47．What does the underlined word “it” in Paragraph 3

　　refer to?

　　A．The dog.

　　B．A patient.

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