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发布时间：2006-06-21 20:59     点击：

(B) how organisms react to invaders

(C) how antibiotics work to cure disease

(D) how the immune systems of vertebrates developed

32. The word "intricate" iii line 1 is closest in meaning to

(A) difficult

(B) widespread

(C) critical

(D) complex

33. The expression "an army" in line 6 is closest in meaning to

(A) an illness

(B) an attack

(C) a large number

(D) a distinct type

34. The expression "an army in line 6 is closest in meaning to

(A) an illness

(B) an attack

(C) a large number

(D) a distinct type

35. According to the passage, some organisms produce antibiotics in order to

(A) prevent disease in humans

(B) aid digestion

(C) fight off other organisms

(D) create new types of nutrients

35.The word "vary" in line 19 is closest in meaning to

(A) differ

(B) endure

(C) balance

(D) contribute

36. The word "they" in line 23 refers to

(A) sponges, worms and shellfish

(B) vertebrates

(C) individuals

(D) transplants

37. According to the passage, a transplant of tissue between genetically incompatible organisms will result in the transplanted tissue

(A) becoming a parasite

(B) being treated as an invader

(C) altering its genetic makeup

(D) developing a new immune system

38. According to the passage, the ability to distinguish between "self" and "nonself" enables vertebrates to

(A) accept transplanted cells

(B) detect and react to invasion

(C) weaken their immune system

(D) get rid of antibiotics

39. All of the following ate defined in the passage EXCEPT

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