C.The sample.
D.The test.
答案:C it指代此句中的the one,而the one又指代上文的samples中来自膀胱癌患者的那一个。
48.The best title for this passage might be ________.
A.A Study Says Dogs Can Smell Cancer
B.Why Dogs Can Smell Cancer
C.A Study on Dogs' Special Ability
D.A Study on Bladder Cancer
答案:A 本文主要介绍狗能嗅出膀胱癌的一项研究成果。选项B、D都只涉及短文的部分内容,选项C太笼统。
49.Dogs can smell cancer because ________.
A.they can smell faster than man
B.their sense of smell is very sensitive
C.they lie down next to patients
D.they show great interest in moles
答案:B 从第一段以及第二段的最后一句可知,狗的嗅觉比人类要灵敏数千倍,这是狗能嗅出癌症的原因。
50.What can we conclude from the last paragraph?
A.Dogs can only smell bladder cancer.
B.Dogs have a good knowledge of cancer.
C.Scientists might invent some equipment to test cancer.
D.Cancer doesn't have any sign in the beginning.
答案:C 根据最后一段中的“That information could then be used to develop machines to test for the chemicals.”可知C项正确。
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