题目内容
Choose the topic sentence in each of the following paragraph.In a student cafeteria, the students serve themselves. When they have finished, they take their dirty dishes back to a special table. In this way the cost of employing cafeteria staff is reduced because there is no need for waiters. The same number of students eat in the cafeteria each day. As a result, the manager can calculate the exact amount of food to buy, and very little is wasted. Finally, the cafeteria makes no profit, which reduces the cost of meals by at least ten per cent. On account of these factors, the Student Union Cafeteria should be able to provide meals at a lower cost than restaurants in town.
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Choose the topic sentence in each of the following paragraph.During the past, dramatic changes have taken place inside the Earth. Indeed, it is probable that if these changes had not taken place, life would not have originated, and we would not be here today. Furthermore, changes are still going on inside the Earth. These show themselves in the occurrence of earthquakes, the activity of volcanoes, and in the movements of mountain ranges. We may conclude, therefore, that the planet we live on is not just a ball of inactive material speeding through space.
Choose the topic sentence in each of the following paragraph.First you must wait for a sunny day. Remember that the rays of the sun are most direct between 11 a.m. and 2 p.m. This is the time when you tan the quickest. At the right time and on the right day, pick an open spot outdoors and lay out a large towel or beach mat. You may want to bring along several things: suntan oil, a portable radio, a book or magazine, sunglasses, a pillow. It is a good idea not to stay in the sun too long at first. Begin with a half hour, and then gradually increase the time you spend in the sun. Certain parts of your body will burn more quickly than others. These include the backs of your knees, the insides of your elbows, your shoulders, and your nose. Be sure to cover these spots with suntan oil when you first go outside. Cover them again with oil after you have been out in the sun for a while.
Write down the possible topic sentence of question 3.First you must wait for a sunny day. Remember that the rays of the sun are most direct between 11 a.m. and 2 p.m. This is the time when you tan the quickest. At the right time and on the right day, pick an open spot outdoors and lay out a large towel or beach mat. You may want to bring along several things: suntan oil, a portable radio, a book or magazine, sunglasses, a pillow. It is a good idea not to stay in the sun too long at first. Begin with a half hour, and then gradually increase the time you spend in the sun. Certain parts of your body will burn more quickly than others. These include the backs of your knees, the insides of your elbows, your shoulders, and your nose. Be sure to cover these spots with suntan oil when you first go outside. Cover them again with oil after you have been out in the sun for a while.
点A的位置可由其坐标（X、Y、Z）唯一地确定，其投影与坐标的关系说法正确的为（ ）。
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