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发布时间：2006-06-21 20:59     点击：

31. In some areas(A) of the United States, unfavorable climate or(B) soil make farming(C)an impossible(D) task.

32. Naturalists have identified(A) at least four hundred of species(B) of mammals andsix hundred types of birds(C) in the state of(D) California.

33. Instead of tooth(A), the blue whale has a row(B) of bony plates in its(C) mouththat functions as(D) a food-collecting device.

34. Murres are black-and-white driving(A) birds that mate every five or six years and lay(B) only a single(C) egg at time(D).

35. A bar code consists(A) a pattern of lines(B) and bars that(C) a computer can translateinto information(D).

36. Hummingbirds are(A) the only(B) birds(C) that can fly to backwards(D).

37. Fluorine, a greenish-yellow gas that is slightly heavy(A) than air is poisonous(B)and corrosive and has a penetrating and disagreeable(D) odor.

38. The Everglades, a large swamp area(A) is an(B) unique wilderness(C) extending over much(D) of southern Florida.

39. Each year(A) millions of tons(B) of fertile topsoil that could(C) produce good crops washed(D) away by rains.

40. Since the(A) 1950's, folk' music has had(B) a significant(C) influence on many(D) popular

vocal and instrumental music.



C

Questions 1-11

Before the 1500's, the western plains of North America were dominated by farmers. One group, the Mandans, lived in the upper Missouri River country, primarily in present-day North Dakota. They had large villages of houses built close together. The tight arrangement enabled the Mandans to protect themselves more easily from the attacks of others who might seek to obtain some of the food these highly capable farmers stored from one year to the next.

1. The Mandans built their houses close together in order to

(A) guard their supplies of food

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