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 nonself 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 nonself and execute a misdirected immune attack.
[C] When a normally functioning immune system attacks a nonself 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 selftolerance.
5. The main idea of the passage may be generalized as_______________
[A] the su
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