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  3. There are some objects in the sky that move so quickly that sometimes you only see them out of the corner of your eye. These are

There are some objects in the sky that move so quickly that sometimes you only see them out of the corner of your eye. These are

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问题     There are some objects in the sky that move so quickly that sometimes you only see them out of the corner of your eye. These are some of the huge number of bits of rock and dust that are floating around in space, called meteoroids. Normally, we cannot see them at all, but if they travel too close to the Earth, they get caught by the pull of the Earth, and begin to fall towards us. They fall faster and faster, until they hit our atmosphere(大气层), by which time they are going so fast that they begin to burn up, and all that you see is a flash of light that moves very quickly across the sky and disappears. These shooting stars, or meteors as they are properly called, are quite common, and sometimes you may see several in a night.
    Most meteoroids are very small bits indeed, and they burn up long before they get to the Earth. However, a very few do manage to get all the way through the atmosphere, and actually fall to the ground. Usually they do not do much damage, although this is not always the case.
    Meteoroids that actually manage to reach the Earth are called meteorites. Most countries have places where meteorites have struck the Earth. Some of these places are very large indeed and are tourist attractions.
The word "meteorites" (Line 1, Para. 3) refers to pieces of rock that________.
选项 A、move fast in outer space
B、have been found at a tourist centre
C、flash through space at a high speed
D、have fallen onto the Earth from space
答案D
解析 细节题。题干意为“‘meteorites’(第三段第一行)是指那些______的石头碎片。”根据本文第三段第一句话“Meteoroids that actually manage to reach the Earth are called meteorites．”可知，真的到达地面的流星被称为陨石，故D正确。
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