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2011年考研英語備考:英語閱讀專項特訓(xùn)(6)[3]

來源:網(wǎng)絡(luò) 時間:2010-10-13 15:59:38

brain in intricacy.

  [C] is enclosed by numerous sensitive cells.

  [D] results in an effective communications network.

  2. The principal task of the immune system is to _______________

  [A] recognize and eliminate all foreign molecules that enter the body.

  [B] remove all the substances that invade the body organisms.

  [C] defend the body from the attacks of different viruses and bacteria.

  [D] identify and specify all nonself molecules it encounters.

  3. The remembering power of a person’s immune system is _______________

  [A] mostly descended from his/her ancestors.

  [B] partially passed down from his/her mother.

  [C] mainly acquired through fighting against foreign cells.

  [D] basically generated by its communications network.

  4. Which of the following is NOT true according to the passage?

  [A] A tissue transplanted from father to daughter would be less acceptable than that transplanted between twins.

  [B] The immune system would never wrongly identify self as nonself and execute a misdirected immune attack.

  [C] When a normally functioning immune system attacks a nonself molecule, the system will remember the specifics of the foreign body.

  [D] The immune cells and other body cells can coexist peaceably in a state known as selftolerance.

  5. The main idea of the passage may be generalized as_______________

  [A] the su
 

結(jié)束

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