What is used to describe the communication network consisting of cells in the immune system、

试卷相关题目

• 1It 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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• 2A 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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• 3Parents 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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• 4Sleep helps brain 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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• 5Paragraph 4________.

  A.Which is better, being an owl or a lark、

  B.What should we avoid、

  C.Why do we need sleep、

  D.What makes people owls or larks、

  E.What helps us fall asleep、

  F.How much sleep do we need、

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• 6The 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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• 7How 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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• 8Which 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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• 9Which 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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• 10People 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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