() 2. —do we need to move to Mars?
—The Earth is crowded and polluted.
A. How B. Why C. What D. Where
科目：初中英语 来源： 题型：
The journey to the Moon is the first step towards space exploration. 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 the Earth,is millions of miles away!Travelling to the planet will be man's next aim. Such travels will be more challenging than the trip to the Moon and certainly more adventurous.
Two American spaceships,Vikings 1 and 2,landed on Mars trying to discover whether that planet has any life on it. So far the sign of life on Mars has neither been confirmed (确认) nor been ruled out Russians have discovered that the surface of Venus (金星) is so hot that it is almost certain that there is no life there. Also the atmosphere of Venus is extremely dense (稠的) 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 their only home for a long time and begin to love and care for it.
() 1. According to the passage,travelling to Mars will be.
A. much easier and even more interesting
B. far more exciting and dangerous
C. man’s final aim
D. man’s first step
() 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. Compared with the Moon,all the planets are much farther to the Earth.
() 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 survive under the conditions of.
A. a hot surface
B. the same pressure as we get on the Earth
C. a 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 going to take the place of the Earth
B. everything needed is provided by the Earth
C. the only home for 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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