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future ，apply to a house agent in one of the threatened areas on the south

coast of England. You can get a house for a knockdown price but it may turn out to be a knockdown home.

51. What is the cause of the problem that people living on parts of the south coast of England face?

A. The rising of the sea level.

B. The experts’ lack of knowledge.

C. The washing-away of limestone cliffs.

D. The disappearance of hotels ，houses and gardens.

52. The erosion of the white cliffs in the south of England .

A. will soon become a problem for people living in central England

B. has now become a threat to the local residents

C. can be stopped if proper measures are taken

D. is quickly changing the map of England

53. The experts’ study on the problem of erosion can .

A. warn people whose homes are in danger

B. provide an effective way to slow it down

C. help to prevent it from worsening

D. lead to its eventual solution

54. It is not feasible to build sea defenses to protect against erosion because ________.

A. house agents along the coast do not support the idea

B. it is too costly and will endanger neighboring areas

C. the government is too slow in taking action

D. they will be easily knocked down by waves and currents

55. According to the author ，when buying a house along the south coast of England ，people should ________________.

A. take the quality of the house into consideration

B. guard against being cheated by the house agent

C. examine the house carefully before making a decision

D. be aware of the potential danger involved Passage 6

Normally a student must attend a certain number of courses in order to graduate, and each course which he attends gives him a credit which he may count towards a degree. In many American universities the total work for a degree consists of thirty-six courses each lasting for one semester. A typical course consists of three classes per week for fifteen weeks; while attending a university a student will probably attend four or five courses during each semester. Normally a student would expect to take four years attending two semesters each year. It is possible to spread the period of work for the degree over a longer period. It is also possible for a student to move between one university and another during his degree course, though this is not in fact done as a regular practice.