[单项选择]

Without proper planning, tourism can cause problems. For example, (21) many tourists can (22) public places that are also enjoyed (23) the inhabitants(居住者) of a country: If tourists (24) too much traffic, the inhabitants become annoyed and (25) . They begin to dislike tourists and to (26) them impolitely. They (27) how much tourism can help the country’s economy. It is important to (28) about the people of a tourist attraction and how tourism affects it. Tourism should help a country (29) the customs and beauty that attract tourists.
Too much tourism can be a problem. If tourism (30) too quickly, people must leave other jobs to work in the tourism industry. This (31) that other parts of the country’s economy can suffer.
On the other hand, if there is not enough tourism, people can (32) jobs. Business can also lose money. It (33) a great de
A. With
B. over
C. for
D. by

Basketball is still a young game. In the winter of 1891, a certain college was having trouble with its boy students. The weather was so terrible that the students had to stay indoors. Since they could not enjoy their sports outside as usual, they were unhappy, and some of them often got into fights from time to time.
Finally, one of the teachers at the college, J. E. Naismith, was asked to invent a new game for the students. It was not an easy job because such a game had to be played indoors, and the court was not very large.
Naismith thought for a few days and invented a kind of ball game. It was a fast, exciting game with much moving and passing of the ball. It was played between two teams. To make score, the ball had to be thrown into a basket ten feet high above the floor on the wall. At each end of the court there was such a basket. At first, Naismith had planned to have the ball thrown into a box. As he could not find boxes of right size, he had to use fruit

Do you find getting up in the morning so difficult that it’s painful This (61) called laziness, but Dr. Kleitman has a new explanation. He has proved that everyone has a daily energy (62) . During the hours when you (63) your work you may say that you’re "hot". That’s true. The time of day when you feel most (64) is when your cycle of body temperature is (65) its peak. For some people the peak comes during the forenoon. For (66) it comes in the afternoon or evening. No one has discovered why this is so, but it (67) such familiar monologues (自言自语) as: Get up John! You’ll be late for work again! The possible explanation to the trouble is that John is at his (68) and energy peak in the evening. (69) family quarreling ends when husbands and wives realize (70) these energy cycles mean, and which cycle each member of the (71) has.
You can’t change your energy cyc
A. other
B. another
C. one another
D. others