Questions 62 to 66 are based on the following passage.
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 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 damage — a 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.
62. According to the first paragraph, the atmosphere is essential to man in that ____.
A) it protects him against the harmful rays from space B) it provides sufficient light for plant growth C) it supplies the heat necessary for human survival D) it screens off the falling meteors
63. We know from the passage that ____. A) exposure to even tiny amounts of radiation is fatal B) the effect of exposure to radiation is slow in coming C) radiation is avoidable in space exploration D) astronauts in spacesuits needn't worry about radiation damage
64. The harm radiation has done to the Apollo crew members ____ A) is significant B) seems overestimated C) is enormous D) remains unknown
65. It can be inferred from the passage that ____. A) the Apollo mission was very successful B) protection from space radiation is no easy job C) astronauts will have deformed children or grandchildren D) radiation is not a threat to well-protected space explorers
66. The best title for this passage would be ____. A) The Atmosphere and Our Environment B) Research on Radiation C) Effects of Space Radiation D) Importance of Protection Against Radiation
Passage 2 文章导读：太空是个充满了神秘的地方，同时也藏着危险。其中来自外太空的辐射尤为恐怖，但是，看完这篇文章，你会相信聪明的人总会找到一些解决办法的。 62. A 问题问的是为什么大气层对人类是至关重要的。文章的第四句说到了大气层屏蔽了大量的外来射线。 63. B A，C，D选项内容在文章中均没有明确肯定，只有B对应了原文的第二段的第四句话---问题在于很难发现辐射对人的损伤，当事人当时可能感觉良好，但是他的遗传细胞可能受到损伤，将会影响到他的孩子，甚至后代。 64. D 从文章中我们得知，到现在为止还没有报告显示阿波罗号受到辐射损害，所以A，B，C选项均与文章意思相悖，只有D相对正确。 65. D 该题对应了原文的最后一段。文章说虽然到现在为止还没有报告显示阿波罗号受到辐射损害，但毕竟它登月的时间短。人类能否长时间接受辐射照射还是个未知数。防辐射的药虽然已经研制出来，但只能削减辐射对人类的损害，还谈不上根治。所以说防太空辐射不是容易的事情。 66. D 此文主要是谈辐射的危害大以及防辐射的一些措施。D最准确。
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 damage — a 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. 
