题目内容
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.
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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（ ）。
点在三投影面体系中的投影规律，下列描述正确的是（ ）。
由两点的坐标值判定两点的相对位置的方法正确的是（ ）。
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