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    We have always been interested in the moon. 2000 years ago people already knew it moved around the earth and where it would be in the sky at different times of the year. At that time, everything about the moon was learned by watching it carefully in the sky.
    When scientists could use telescopes(望远镜) to study the moon more closely, their ideas began to change. They could see the moon was made of rocks. Most scientists thought moon rocks would be different from those on Earth. This was because they believed the moon had once been a planet that had been caught in the earth’s gravity millions of years earlier.
    In 1969 moon rocks were finally brought to the earth and studied. Much to their surprise, scientists found that, except for water, the moon and the earth were made of the same things. Once again new ideas were needed for this new information.
    After years of study, most scientists now think that the moon was once part of Earth. They believe very early in its history, maybe 4 million years ago, something about the size of Mars hit Earth. This sent billions of rocks into space around our planet. These rocks slowly joined together and after many years became the moon.
    In the future, even though our ideas about the moon may change again, we will still be interested in it.
    小题1:From the passage we know the moon was made of_____________.
    A．earthB．rocksC．waterD．metal
    小题2:In the passage the writer wants to tell us ___________________.
    A．why people are interested in the moon
    B．how ideas about the moon have changed over time
    C．where the moon came from in the past
    D．that people have finally learned the truth about the moon.
    小题3:Before 1969 most scientists thought the moon was ______________.
    A．part of the earth billions of years earlier
    B．older than the earth
    C．a planet caught by the earth’s gravity
    D．made of the same things as the earth
    小题4:From this passage we can learn that ___________________.
    A．scientists in the past were not clever
    B．the earth was once part of the moon
    C．we now know everything about the moon
    D．new information brings new ideas

    小题1:B
    小题2:B
    小题3:C
    小题4:D

    小题1:根据文章内容They could see the moon was made of rocks. Most scientists thought moon rocks would be different from those on Earth可知答案为B
    小题2:根据文章内容可知答案为B
    小题3:根据文章内容This was because they believed the moon had once been a planet that had been caught in the earth’s gravity millions of years earlier.可知答案为C
    小题4:根据文章内容答语，可知答案为D
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