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发布时间：2006-06-21 20:59     点击：

(C) soil nutrients

(D) water

34. Thc passage suggests that Douglas fir trees are

(A)a type of alder

(B)a type of evergreen

(C)similar to sword ferns

(D)fast-growing trees

35. It can be inferred from paragraph I that hemlock trees

(A) are similar in size to alder trees.

(B) interfere with the growth of Douglas fir trees

(C) reduce the number of alder trees In the forest

(D) need less sunlight than do Douglas fir trees

36. It can be inferred from paragraph 2 that previous generations of foresters

(A) did not study the effects of alders on forests

(B) did not want alders In forests

(C) harvested alders for lumber

(D) used alders to control the growth of evergreens

37. The word "they" in line 21 refers to

(A) newly developing soils

(B) alders

(C) bags

(D) chemical changes

38. According to the passage that alders are used in mountainous areas to

(A) nitrogen

(B) calcium

(C) carbon

(D) oxygen

39. It can be Inferred from the passage that alders are used in mountainous areas to

(A) prevent water from carrying away soil

(B) hold the snow

(C) protect mines

(D) provide material for housing

40. What is the author's main purpose in the passage?

(A) To argue that alder trees are useful in forest management

(B) To explain the life cycle of alder trees

(C) To criticize the way alders take over and eliminate forests

(D) To illustrate how alder trees control soil erosion

Questions 41-50

With the open countryside everywhere at hand, city dwellers naturally shared in some of the rural diversions. Favored recreations included fishing, hunting1 skating, and swimming. But city dwellers also developed other pleasures. which only compact communities made possible.

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