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  3. For thousands of years, people have looked up at the night sky and looked at the moon. They wondered what the moon was made of.

For thousands of years, people have looked up at the night sky and looked at the moon. They wondered what the moon was made of.

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问题     For thousands of years, people have looked up at the night sky and looked at the moon. They wondered what the moon was made of. They wanted to know how big it was and how far away it was. One of the most interesting questions was "Where did the moon come from?" No one knew for sure. Scientists developed many different theories, or guesses, but they could not prove that their ideas were correct.
    Then, between 1969 and 1972, the United States sent astronauts to the moon. They studied the moon and returned to the earth with rock samples. Scientists have studied these pieces of rock, the moon’s movements, and information about the moon and the earth. They can finally answer questions about the origin of the moon.
    Today most scientists believe that the moon formed from the earth. They think that a large object hit the earth early in its history. Perhaps the object was as big as Alars. When the object hit the earth, huge pieces of the earth broke off. These pieces then moved around the earth. After a brief time, the pieces came together and formed the moon.
    This "impact (撞击) theory" exposes many facts about the earth and the moon. For example, the moon is very dry because the impact created so much heat that it dried up all the water. The earth has iron in its center. However, the moon has very little iron in its center. This is because the moon formed from lighter materials that make up the outer part of the earth. Finally, the earth and the moon are almost of the same age: the earth is about 4.5 billion years old, while the moon is about 4.4 billion years old.
    No one can prove that something really happened billions of years ago. In the future, new information will either support this theory or show that it is wrong. For now, scientists accept the impact theory because it explains what we know today about the earth and the moon.
The "impact theory" sounds reasonable because_____ .
选项 A、scientists have found what happened billions of years ago
B、it is based on the newly gathered information about Mars
C、it can answer many questions raised about the moon and the earth
D、astronauts believe that the moon and the earth are of the same age
答案C
解析 本题为细节题，关键在于本文的最后一句“For now, scientists accept the impact theory because it explains what we know today about the earth and the moon．”。本句说明这一理论合理，原因在于选项C．it can answer many questions raised about the moon and the earth。选项A中“what happened billions of years ago”尚未被科学家发现，科学家只知道两个球体的年龄为billions of years。选项B中“the newly gathered information about Mars”文章中没有提及，因此不是本文的答案。选项D有两处不对，一是“impact theory”在原文中的句子主体是“scientists”，而非“astronauts”；二是地球和月球也并非同样古老(“of the same age”)。
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