题目内容

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.

A. The first sentence
B. The second sentence
C. The last sentence
D. Needs to Paraphrase

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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.

A. The first sentence
B. The second sentence
C. The last sentence
D. Needs to Paraphrase

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（）。

A. 点A的水平投影a由X、Y两坐标确定
B. 点A的正面投影a′由X、Z两坐标确定
C. 点A的侧面投影a″由Y、Z两坐标确定
D. 其他

点在三投影面体系中的投影规律，下列描述正确的是（）。

A. 点的正面投影与水平投影的连线垂直于X轴。
B. 点的正面投影与侧面投影的连线垂直于Z轴。
C. 点的水平投影到X轴的距离等于该点的侧面投影到Z轴的距离。
D. 点的正面投影到Z轴的距离等于该点的水平投影到Y轴的距离。