Which of the following statements is true、

试卷相关题目

• 1How 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．

  开始考试点击查看答案
• 2The immune cells and other cells in the body coexist peaceably in a state known as

  A.self-tolerance

  B.balance

  C.harmony

  D.tolerance

  开始考试点击查看答案
• 3What 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．

  开始考试点击查看答案
• 4It 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

  开始考试点击查看答案
• 5A 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

  开始考试点击查看答案
• 6Which 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

  开始考试点击查看答案
• 7People 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．

  开始考试点击查看答案
• 8The word“detected”in paragraph 3 could be best replaced by

  A.cured．

  B.removed．

  C.discovered

  D.caused

  开始考试点击查看答案
• 9The 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．

  开始考试点击查看答案
• 10On 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．

  开始考试点击查看答案