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    The journey to the moon has been the first step towards future exploration（探险） in space. The distance between the Moon and the Earth is very short indeed when compared with the distances between the Earth and other planets. Mars, the nearest planet to Earth is millions of miles away! Traveling to the planets will be man’s next aim. Such travels will be more difficult than the trip to the moon and certainly more adventurous（冒险）.

    Recently, two American spaceships, Virkings 1 and 2, landed on Mars, trying to discover whether that planet has any life on it. So far the signs of life on Mars has neither confirmed（确认） nor ruled out. Russians have discovered that the surface of Venus is so hot that it is almost certain that there is no life there. Also the atmosphere of Venus（金星） is very dense（稠） and the pressure is nearly a hundred times greater than that of the Earth’s atmosphere.

    Scientists believe man may find planets which have the same conditions as those we have on the Earth, but man should realize the Earth will be his only home for a long time and begin to love and care for it.

    1.According to the passage, traveling to the planets will be ________.

    A. much easier and even more interesting

    B. for more exciting and dangerous

    C. man’s final aim

    D. man’s first aim

    2.Which of the following is not true?

    A. Mars is nearer to the earth than the moon.

    B. The moon is much nearer to the earth than Mars.

    C. Of all the planets, Mars is the nearest to the earth.

    D. All the planets are much farther to the earth than the moon.

    3. From the passage, we can guess _______.

    A. there is life on Mars

    B. there is no life on Mars

    C. the atmosphere of Mars is not so dense as that of Venus

    D. scientists will have little hope to find the answers

    4. Man can live on under the conditions of _______.

    A. much too hot surface

    B. the same pressure as we get on the earth

    C. normal atmosphere as we have on the earth

    D. Both B and C

    5.Scientists think we should take care of our earth because _______.

    A. no other planets are to take the place of the earth

    B. everything needed is provided by the earth

    C. the only home of man will be the earth for a long time

    D. the dream to find another home for man will come true

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