how to duplicate what they have seen or read. All there have resulted in a high frequency of

crimes committed both by professional criminals and by nonprofessional ones in murder,

drug smuggling, robbery, etc.

51. The author intends to tell the readers that _____.

A. the United States is a wealthy country although poverty and crime exist there.

B. crime has become a serious problem in the United States, although it is said to be a prosperous one.

C . despite the fact that crimes have been increasing rapidly in the United States, it is a Country of prosperity.

D. in spite of stories about poverty and crime in the United States, it is prospering at an Increasing rate.

52. Besides bad material conditions,_____ also leads to the sharp increase of crime rate.

A.poverty B.being parentless C.lack of education D. easy access to guns 53. Which of the following is correct according to the text?

A.Of the criminals arrested in 1970, fifty-seven percent were youths below twenty five Of age.

B.Lack of education has little to do with the crime rate.

C.Differences in state laws for death penalty also account for the increase of crime rate .

D.Drug smuggling is the only product of too many shows and report. 54. The author is worried about the fact that _____.

A.children may imitate what they have seen or read about crimes. B. the more prosperous the United States is, the higher the crime rate becomes.

C. citizens carrying guns will be punished.

D. all the state laws will provide death penalty in future. 55.The underlined word “penalty” is closest in meaning to_____. A. punishment B.trial C. accusation D.execution Task 3

We know that many animals do not stay in one place. Birds, fish and other animals

Move from one place to another at a certain time. They move for different reasons;most of

Them move to find food more easily, but others move get away form places

that are too Corwded.

When cold weather comes,many birds move to warmer places to find food. Some fishes

Give birth in warm water and move to cold water to feed. The most famous migration(迁移)

Is probably the migration of the fish, which is called “salmon”.This fish is born in fresh

Water but it travels many miles to salt water. Then it gives birth and dies there. In northern

Europe, there is a kind of mouse. They leave their mountain homes when they become too

Crowded. They move down to the low land. Sometimes they move all the way to the seaside,

And many of them are killed when they fall into the sea.

Recently, scientists have studied the migration of a kind of lobster(龙虾). Every year,

When the season of bad weather arrives, the lobsters get into a long line and start to walk

Across the floor of the ocean. Nobody knows why they do this, and nobody knows where They go .

So, sometimes we know why humans and animals move from one place to another,

But at other times we don’t. Maybe living things just like to travel. 56. The majority of animals migrate for______.

A. place B. safety C. Food D.warmth

57. Salmon is known as a creature spending most of its life in _______. A.they are short of food B.there is not enough space

C.it’s getting warmer in the low land D.it’s getting coldier in the mountains

58. The reason why the lobsters migrate is _______.

A. the bad weather B. the depth of the ocean

C. scientist’lack of interest D. unkown 60. The passage is mainly about _______.

A, living things on the moove B. the most famous migration C. mice in northern Europe D. migration of lobsters Task 4

You can tell age of a tree by counting its rings.But these records of a tree’s life really

say a lot more. Scientists are using tree rings to learn what’s been happening on the sun’s surface

for the last ten thousand years. Each ring represents a year of growth.