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

试卷相关题目

• 1The 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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• 2What is used to describe the communication network consisting of cells in the immune system、

  A.The immune system’s memory．

  B.Immune troops eliminating intruders．

  C.Bees flying around a hive．

  D.A sea of microbes．

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• 3It is good advice for most people to________.

  A.stay up till the early hours of the morning

  B.sleep enough to bring most refreshment

  C.rebuild memories stored during the day

  D.store memories in the brain

  E.get up quite early

  F.keep away from coffee in the evening

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• 4A good lifestyle means one can________.

  A.stay up till the early hours of the morning

  B.sleep enough to bring most refreshment

  C.rebuild memories stored during the day

  D.store memories in the brain

  E.get up quite early

  F.keep away from coffee in the evening

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• 5Parents with very young children tend to________.．

  A.stay up till the early hours of the morning

  B.sleep enough to bring most refreshment

  C.rebuild memories stored during the day

  D.store memories in the brain

  E.get up quite early

  F.keep away from coffee in the evening

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• 6Which 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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• 7Which 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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• 8People 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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• 9The word“detected”in paragraph 3 could be best replaced by

  A.cured．

  B.removed．

  C.discovered

  D.caused

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• 10The 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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