2. 外语
  3. A scientist once said, "I have concluded that the earth is being visited by intelligently controlled vehicles from outer space."

A scientist once said, "I have concluded that the earth is being visited by intelligently controlled vehicles from outer space."

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问题     A scientist once said, "I have concluded that the earth is being visited by intelligently controlled vehicles from outer space."
    If we take this as a reasonable explanation for UFOs (unidentified flying object), questions immediately come up.
    "Why don’t they get in touch with us, then? Why don’t they land right on the White House lawn and declare themselves,  people asked.
    In reply, scientists say that, while this may be what we want, it may not necessarily be what they want.
    "The most likely explanation, it seems to me," said Dr. Mead, "is that the responsible society outside our solar system is keeping an eye on us to see that we don’t set in motion a chain reaction that they might have unexpected effects far outside our solar system."
    Opinions from other scientists might go like this, "Why should they want to get in touch with us? They may want to observe us only and not interfere with the development of our civilization."
    Some scientists have also suggested that Earth is a kind of zoo or wildlife reserve. Just as we set aside wilderness areas and wildlife reserves to allow animals and growing things to develop naturally while we observe them, so perhaps Earth was set aside ages ago for the same purpose.
    Are we being observed by intelligent beings from other civilizations in the universe? Are they watching our progress in space travel? Do we live in a gigantic "zoo" observed by our "keepers", but having no communication with them? Now we have to recognize that, among the stars in the heavens, there may very well be worlds inhabited by beings who are to us as we are to ants.
In Line 3, Last Para. the word "keepers" refers to ______.
选项 A、persons who look after animals in a gigantic zoo
B、astronauts travelling in the manned space ship
C、persons who are observing us
D、intelligent beings observing us from outer space
答案D
解析
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