The word“detected”in paragraph 3 could be best replaced by

试卷相关题目

• 1People buy cell phones for the following reasons EXCEPT that

  A.they’re popular．

  B.they’re useful．

  C.they’re cheap．

  D.they’re convenient．

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• 2Which of the following best expresses the main idea of this passage、

  A.An antigen is any substance that triggers an immune response．

  B.One of the immune system’s primary functions is the allergic response．

  C.The human body is an appropriate habitat for microbes．

  D.The basic function of the immune system is to distinguish between self and nonself

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• 3Which of the following statements is true、

  A.Allergens are usually harmful substances．

  B.Antigens can trigger an immune response．

  C.People with antigens do not suffer from obvious responses．

  D.There is no difference between an antigen and an allergen．

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• 4How do the immune cells recognize an antigen as“foreign”or“nonself”、

  A.Through an allergic response．

  B.Through blood type．

  C.Through characteristic shapes on the antigen surface．

  D.Through fine hairs protruding from the antigen surface．

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• 5The immune cells and other cells in the body coexist peaceably in a state known as

  A.self-tolerance

  B.balance

  C.harmony

  D.tolerance

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• 6The salesman retired young because

  A.he disliked using mobile phones．

  B.he was tired of talking on his mobile phone．

  C.his employer’s doctor persuaded him to．

  D.he couldn’t remember simple tasks．

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• 7On the safety issue of mobile phones，the manufacturing companies

  A.deny the existence of mobile phone radiation．

  B.develop new technology to reduce mobile phone radiation．

  C.try to prove that mobile phones are not harmful to health．

  D.hold that the amount of radiation is too small to worry about．

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• 8The writer’s purpose of writing this article is to advise people

  A.to buy mobile phones．

  B.to use mobile phones less often．

  C.to update regular phones．

  D.to stop using mobile phones．

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• 9Antimicrobial resistance has become a global public health issue because

  A.new antibiotics are too expensive for poor countries．

  B.infections caused by multi—drug resistant bacteria have killed a lot of people．

  C.scientists know nothing about multi-drug resistant bacteria．

  D.there may be few or no treatment to infections caused by multi-drug resistant bacteria．

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• 10The word“prudent’’in paragraph I is closest in meaning to

  A.unwise

  B.careful

  C.wasteful

  D.widespread

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