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16．Have you ever noticed how much the number twelve is used？A ruler that is a foot long has twelve inches．A yardstick（尺码） has three times twelves inches，or thirty-six inches．
On a canlender you will see twelve months in each year．A clock face is numbered from one to twelve for the hours．The time span from noon to midnight is twelve hours； from midnight to noon there are twelve more hours．Each day is two times twelve，or twenty-four hours long．
We buy eggs by the dozen，which means twelve at once．Sometimes we buy other things by the dozen．The stores sell different things by the dozen．In a store you may have seen a dozen pencils held together by a paper wrapping or a dozen oranges in a sack．Stores also buy things in lots of twelve dozens，or by the gross（罗，12 打）．One gross consists of twelve dozens，or one hundred and forty-four items．
33．An outside cover is aD．
A．bag
B．sack
C．number
D．wrapping
34．A means a space of time．
A．Span
B．Gross
C．Room
D．Canlender
35．A foot-long ruler hasB inches．
A．six
B．twelve
C．twenty-four
D．thirty-six． 试题答案
分析 本文属于说明文阅读，作者通过这篇文章主要向我们描述了数字十二的意义，它在不同的情况下有着不同的意义，极有意思．
解答 33．D．词义理解题．根据最后一段In a store you may have seen a dozen pencils held together by a paper wrapping or a dozen oranges in a sack可知An outside cover 意味着包装；故选D．
34．A．推理判断题．根据第二段The time span from noon to midnight is twelve hours可知中午到午夜的时间跨度是十二小时，这是时间的空间；故选A．
35．B．细节理解题．根据第一段A ruler that is a foot long has twelve inches．A yardstick（尺码） has three times twelves inches，or thirty-six inches可知一把尺子长十二英寸；故选B．
点评 考察学生的细节理解和推理判断能力，做细节理解题时一定要找到文章中的原句，和题干进行比较，再做出正确的选择．在做推理判断题不要以个人的主观想象代替文章的事实，要根据文章事实进行合乎逻辑的推理判断．
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 necessary for plants to make the food that 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 0.1rem without being damaged; the figure of 60 rems 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 not be discovered until 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(积累) a large 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.
1.In which way is the atmosphere necessary to man according to the first paragraph?
A. It screens off the falling meteors.
B. It provides enough light for plants to grow.
C. It supplies the heat necessary for human survival.
D. It protects him against the harmful rays from space.
2.We know from the passage that .
A. exposure to even tiny amount of radiation is fatal( 致命的)
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
3.The underlined word “deformed” probably means .
A. badly-shaped B. weak
C. naturally-grown D. ugly
4.It can be inferred from the passage that .
A. the Apollo mission was very successful
B. astronauts will have deformed children or grandchildren
C. protection from space radiation is no eas
y job
D. radiation is not a threat to well-protected space explorers
