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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.
It is believed by most scientists that______.
选项 A、the moon was hit by an object as large as Mars
B、the moon formed from pieces of rock from Mars
C、the pieces from Mars came together to form the earth
D、the moon is made up of materials similar to those of the earth
答案D
解析 本题为细节题，解题的关键在于“Today most scientists believe that the moon formed from the earth．”。其后内容全部用于说明“huge pieces of the earth”，因此，选项D为正确答案。选项A中所给信息在原文中的表述是“perhaps”，因此与原文不符。选项B中所说“pieces of rock from Mars”原文中没有提及，而原文第三段唯一提到“pieces”的是“huge pieces of the earth broke off”，所以大多数科学家相信的是地球经撞击有碎片脱落，而不是火星。
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