[填空题]The ideas that life may exist somewhere out in space have been with us for a long time. The first and most natural place for life to exist (1) earth was on the moon, and for centuries man has speculated that life of some kind might exist there. When there was the (2) that the moon was both too hot and too cold, there then came the suggestion that life might exist below the surface, protected from the extreme (3) . However, with the series of unmanned and then manned landings on the moon in the 1960s and 1970s, the idea that life of any kind existed on the moon had to be abandoned. Similarly, Mars was for a long time rumoured to be the home of (4) creatures, and there were many theories about the so-called "canals" on Mars. For a long time, many people, including scientists, believed that they might have been constructed by non-human intelligences. The Viking spacecrafts landing on Mars during the second part of the last decade have effectively

[填空题]The ideas that life may exist somewhere out in space have been with us for a long time. The first and most natural place for life to exist (1) earth was on the moon, and for centuries man has speculated that life of some kind might exist there. When there was the (2) that the moon was both too hot and too cold, there then came the suggestion that life might exist below the surface, protected from the extreme (3) . However, with the series of unmanned and then manned landings on the moon in the 1960s and 1970s, the idea that life of any kind existed on the moon had to be abandoned. Similarly, Mars was for a long time rumoured to be the home of (4) creatures, and there were many theories about the so-called "canals" on Mars. For a long time, many people, including scientists, believed that they might have been constructed by non-human intelligences. The Viking spacecrafts landing on Mars during the second part of the last decade have effectively

[填空题]All of us who live a busy life may ask this question: how can I find time to read The answer may be 15 minutes a day at any time. No universal formula can be prescribed. Each of us must find our own 15-minutes period each day. It is better if it is regular.
The only requirement is the will to read. With it you can find the 15 minutes no matter how busy the day is. And you must have the book at hand. Not even seconds of your 15 minutes should be wasted when you start to read. Set the book out in advance. Put it into your pocket when you dress. Put another book beside your bed. Place one in your bathroom. Keep one near your dining table.
You can’t escape reading 15 minutes a day, and that means you will read half a book a week, 2 books a month, 20 a year, and 1,000 or more in a life time reading. It’s an easy way to become well read.
How to Find Time to Read
The suitable time may be (46) a day at any time.
It’ll be better if (47)
The only requirement

[单项选择] The ups and downs of life may seem to have no predictable plan. But scientists now know there are very definite patterns that almost all people share. Even if you’’ve passed some of your "prime", you still have other prime years to experience in the future. When are you smartest From 18 to 25, according to I. Q. scores; but you’’re wiser and more experienced with increasing age. You’’re sharpest in your 20’’s. But your I. Q. for other tasks climbs. Your vocabulary at age 45, for example, is three times as great as when you graduated from college. At 60, your brain possesses almost four times as much information as it did at age 21. When are you happiest You have the best physical sense of yourself from 15 to 24; the best professional sense from 40 to 44. Before age 24, we believe that our happiest years are yet to come; over 30, we believe that they’’re behind us. A National Health Survey agrees: After age 30, we become more realistic and do not view happines
A. the age of ideal physical condition
B. be early in time or order
C. the period of ideal or peak condition
D. the most special days

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