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- 31What 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.
开始考试练习点击查看答案 - 32The immune cells and other cells in the body coexist peaceably in a state known as
A.self-tolerance
B.balance
C.harmony
D.tolerance
开始考试练习点击查看答案 - 33How 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.
开始考试练习点击查看答案 - 34Which 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.
开始考试练习点击查看答案 - 35Which 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
开始考试练习点击查看答案 - 36People 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.
开始考试练习点击查看答案 - 37The word“detected”in paragraph 3 could be best replaced by
A.cured.
B.removed.
C.discovered
D.caused
开始考试练习点击查看答案 - 38The 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.
开始考试练习点击查看答案 - 39On 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.
开始考试练习点击查看答案 - 40The 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.
开始考试练习点击查看答案
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