Now that man has actually landed on the surface of the moon, he has learned many new things about it. But one thing man knew before he ever reached the moon was that there was no life on it.
There is no atmosphere on the moon. The lack of air means that the moon is not protected from any of the sun’s rays. The sun sends out heat and light radiation (辐射). Life on the earth depends on heat and light. But the sun also sends out dangerous kinds of radiation. The earth’s atmosphere protects us from most of them. On the moon, however, there is no atmosphere to stop the radiation. All the sun’s rays beat down on the surface of the moon.
Because there is no atmosphere, the moon’s surface is either extremely hot or extremely cold. As the moon circles around the earth, the side of it that is lighted up by the sun becomes very hot. The temperature there reaches more than 300 degrees Fahrenheit (华氏温度). This is hotter than boiling water. The hot luna
A. Why is there no air on the moon
B. Why is the moon colder than the South Pole
C. Why is the moon hotter than the earth
D. Why is there no life on the moon
| Now that man has actually landed on the
surface of the moon, he has learned many new things about it. But one thing man
knew before he ever reached the moon was that there was no life on it. There is no atmosphere on the moon. The lack of air means that the moon is not protected from any of the sun’s rays. The sun sends out heat and light radiation (辐射). Life on the earth depends on heat and light. But the sun also sends out dangerous kinds of radiation. The earth’s atmosphere protects us from most of them. On the moon, however, there is no atmosphere to stop the radiation. All the sun’s rays beat down on the surface of the moon. Because there is no atmosphere, the moon’s surface is either extremely hot or extremely cold. As the moon circles around the earth, the side of it that is lighted up by the sun becomes very hot. The A. Why is there no air on the moon B. Why is the moon colder than the South Pole C. Why is the moon hotter than the earth D. Why is there no life on the moon [单项选择]The man has never seen a horse before, has he
A. Yes, he has. B. No, he hasn’t. C. Yes, he hasn’t. [单项选择]A. The man has retired. B. The man always gets up very late.
C. The man doesn’t like doing exercises. D. The man always spends his day at home. [单项选择]Passage Five
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