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发布时间：2006-06-21 21:01     点击：

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38. (A) The safety record of the railroad industry.

(B) The reasons railroad regulations were

changed.

(C) The financing of railroad construction.

(D) The evolution of the railroad industry.

39. (A) The use of oversized freight containers.

(B) Safety problems with railroad tracks.

(C) The growth of the automotive industry.

(D) The high cost of meeting environmental

regulations.

40. (A) It contributes less to air pollution than other

kinds of transportation.

(B) Its competitors are inconsiderate of

customers.

(C) It preserves a traditional way of doing

business.

(D) It creates personal fortunes for investors.

41. (A) The hiring of extra traffic patrollers.

(B) The creation of government agencies.

(C) The construction of new tunnels.

(D) The repair of public roads.

42. (A) To discuss how microbes affect plants.

(B) To introduce the main categories of

microbes.

(C) To demonstrate the use of a microscope.

(D) To describe the structure of bacteria.

43. (A) To show how common microbes are.

(B) To prove how well his gardening methods

work.

(C) To provide an example of an uncommon

mold.

(D) To diagnose why his plants are sick.

44. (A) They are difficult to see in the slide.

(B) There are an unusual number of them in the

sample.

(C) He finds them more interesting than other

microbes.

(D) They are beneficial to people.

45. (A) A photograph of his garden.

(B) Microscope slides.

(C) Drawings of microbes.

(D) A chart of soil components.

46. (A) The popularity and drawbacks of winter

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