职称英语（理工类）模拟试题 2
Moon Exploration
Many people wonder why some men want to live on the moon. （46） _______. It is a silent place, where the weather is hot and sunny or cold and dark. Its surface is dull and almost colourless. There are no lakes, rivers, or plants to provide beauty. （47） _______. Astronauts on the moon certainly miss the comfort of life on earth. But man has always moved to new frontiers. Every pioneer in a new land has faced danger and hardship.
Some scientists hope that continued work will be done on the moon. Many experiments will be done there more easily. （48） _______. Matter can be heated to very high temperatures without chemical change when it is in a vacuum. Air, dust, and clouds cannot block mans view of space from the mood. The very high or very low temperatures and low gravity on the moon will be used for many experiments. One very important use of the moon will be to launch spacecraft.
Man might be able to learn much about his own body by living on the moon. （49） _______. Man would be in control of the community of life in which he lives. Bacteria could be removed from the air in this community.
Gravity is one thing that would not be under mans control. Some scientists believe the low gravity of the moon would be healthful for man. The heart would not have to work so hard. The body would need less energy to move than it does on the earth. （50） _______. Much exercise would probably be needed to keep the body in good condition.
A. He would be living in a habitat that he made for himself.
B. However, the human body might change during long stays on the moon.
C. But man cannot live there happily and comfortably.
D. It is probably not the kind of place where most men would choose to live.
E. A simple walk on the moons surface is filled with danger.
F. Some large experiments are very easy to do in a vacuum.
7.第6部分：完形填空
Radiation
Space is a （51） ______ place, not only because of meteors but also because of rays from the sun and other stars. The atmosphere again （52） ______ our protective blanket on earth. Light gets through, and this is （53） ______ for plants to make the food which we eat. Heat, too, makes our environment endurable. （54） ______ 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 （55） ______ 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 （56） ______ to think that a man can （57） ______ far more radiation than 0.1 rem （58） ______ being damaged; the figure of 60 reins has been agreed on. The trouble is that it is extremely difficult to be sure about radiation damage－a person may feel perfectly （59） ______, but the cells of his or her sex organs may be （60） ______, and this will not be discovered （61） ______ the birth of deformed children or even grandchildren. Missions of the Apollo flights have had to cross belts of high radiation and, during the outward and return journeys, the Apollo crew accumulated a large amount of rems. （62） ______, no dangerous amounts of radiation have been reported, but the Apollo missions have been quite （63） ______. 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 （64） ______ the damage done by radiation, but no really （65） ______ ones have been found so far.
Notes：
①meteor n. 流星
②deformed a. 畸形的
51. A. interesting B. dangerous C. safe D. mysterious
52. A. acts as B. is used C. become D. grow
53. A. essential B. pleasant C. critical D. dependent
54. A. All B. Various C. Many D. Much
55. A. harmed B. protected C. exposed D. covered
56. A. reason B. already C. explanation D. excuse
57. A. deal with B. put up with C. cope with D. absorb
58. A. with B. before C. when D. without
59. A. bad B. sick C. well D. safe
60. A. burnt B. damaged C. hurt D. destroyed
61. A. until B. before C. after D. while
62. A. So far B. Now C. However D. But
63. A. long B. difficult C. short D. challenging
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