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    You might see aliens（外星人） in books and movies. They look strange. They are very smart. They travel in spaceships.

    But are there really aliens in space? British scientist Stephen Hawking thinks so. He says that people should not look for aliens. He thinks they are dangerous. On a new British TV program, Hawking says, “It is quite possible that there are aliens in space. They might live in big spaceships. They have used up all the resources in their home planet.” He thinks such aliens are sure to get resources from Earth and then go away back to their own planet. They may bring troubles to the earth, too.

    1.The famous British scientist Stephen Hawking says people should not look for aliens because they are _____.

    A. strange B. smart C. dangerous D. useless

    2.According to Mr. Hawking, aliens probably __________.

    A. live on Earth

    B. have left their own planet and wanted to live on Earth

    C. broke the big spaceship they lived in

    D. have used up their resources

    3.Mr. Hawking believes that aliens will come to the earth to ________.

    A. cause trouble B. get resources C. make a living D. fight with human

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