题目内容
A．It has helped relieve hunger in some developing countries.B．It has improved animal b
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Young people in the United States have a wide variety of interests apart【C1】______their school work. As children, both boys and girls play many of the same【C2】______. They swim, play baseball and basketball, go boating and【C3】______, and have fun in many kinds of sports and outdoor activities.
Secondary schools offer students a wide【C4】______of activities to develop talents and skills. There are clubs for photography, music, theater, art, stamp【C5】______, natural science and debating. Often schools have orchestras, bands and groupsinging clubs. Most schools and colleges have some【C6】______of student government. Almost【C7】______school holds elections to choose class representatives. These elected officers speak【C8】______their fellow students at student council meetings with teachers and school officials. They al so organize social activities and【C9】______part in such community projects【C10】______raising money for public welfare.
Many young people【C11】______parttime jobs after school hours. Thousands of them earn motley delivering newspapers or【C12】______care for infants and young children in private homes. Later,【C13】______they go to college,【C14】______youths continue to work parttime at a variety of jobs to help【C15】______their expenses.
For several weeks during the summer【C16】______, about 5 million school age children go to camps【C17】______they get plenty of recreation al activity and【C18】______various skills. There are more than 10,000 camps operated by【C19】______citizens and organizations. College students often work as counselors【C20】______these camps.
【C1】
A．Traditional.B．Modern.C．Special.D．Unfriendly.
Space is a dangerous place, not only because of meteors (流星) but also because of rays from the sun and other stars. The atmosphere again acts as our protective blanket on earth. Light gets through, and this is essential for plants to make the food which we eat. Heat, too, makes our environment endurable. Various kinds of rays come through the air from outer space, but enormous quantities of radiation from the sun are screened off. As soon as men leave the atmosphere they are exposed to this radiation but their spacesuits or the walls of their spacecraft, if they are inside, do prevent a lot of radiation damage.
Radiation is the greatest known danger to explorers in space. The unit of radiation is called "rem". Scientists have reason to think that a man can put up with far more radiation than 0.1 rem without being damaged; the figure of 60 reins has been agreed on. The trouble is that it is extremely difficult to be sure about radiation damagea person may feel perfectly well, but the cells of his or her sex organs may be damaged, and this will no be discovered until the birth of deformed children or even grandchildren.
Missions of the Apollo flights have had to cross belts of high amount of rems. So far, no dangerous amounts of radiation have been reported, but the Apollo missions have been quite short. We simply do not know yet how men are going to get on when they spend weeks and months outside the protection of the atmosphere, working in a space laboratory. Drugs might help to decrease the damage done by radiation, but no really effective ones have been found so far.
According to the first paragraph, the atmosphere is essential to man in that ______.
The following passage will probably be:
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