阅读理解
Many scientists today are sure that life exists elsewhere in the universe--life probably much like that on our planet. They reason in the following way.
As far as scientists can determine, the entire universe is built of the same matter. They have no reason to doubt that matter obeys the same laws in every part of the universe. Therefore, it is reasonable to guess that other stars, with their own planets, were born in the same way as our solar(太阳)system. What we know of life on earth suggests that life will arise wherever the proper conditions exist.
Life requires the right amount and kind of atmosphere(大气层). This eliminates(排除) all those planets in the universe that are not about the same size and weight as the earth. A smaller planet would lose its atmosphere; a larger one would hold too much of it.
Life also requires regular supply of heat and light. This eliminates double stars, or stars that flash up suddenly. Only single stars that are regular sources of heat and light like the sun would qualify.
Finally, life could develop gradually only if the planet is just the right distance from its sun. With a weaker sun than our own, the planet would have to be closer to it. With a stronger sun, it would have to be farther away.
If we suppose that every star in the universe has a family of planets, then how many planets might support life? First, eliminate those stars that are not like our sun. Next, eliminate most of their planets; they are either too far from or too close to their suns. Then eliminate all those planets that are not the same size and weight as the earth. Finally, remember that the proper conditions do not necessarily mean that life actually does exist on a planet. It may not have begun yet, or it may have already died out.
This process of elimination seems to leave very few planets on which earthlike life might be found.However, even if life could exist on only one planet in a million, there are 80 many billions of planets that this would still leave a vast number on which life could exist.
1.Scientists believe that matter in different parts of the universe _____.
[ ]
A.has different laws
B.has one common law
C.shares the same laws
D.shares no common law
2.The existence of life depends on all except _____.
[ ]
A.a right amount of atmosphere
B.a right quantity of coal and oil
C.regular heat and light
D.a right distance from the sun
3.Which of the following statements is wrong?
[ ]
A.Where there's a planet like our earth,there may be life existing.
B.Proper conditions are necessary to the existence of life.
C.Double stars can provide regular light and heat.
D.A right distance between a planet and its sun is necessary for life.
4.At the end of the passage the author suggests that _____.
[ ]
A.it is impossible for life to exist on other planets
B.earthlike life could only exist on a few planets
C.life could exist on only one planet in a million
D.life could exist on a great number of planets
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