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　　As space science develops, man has learned more and more about space．Space is not only amazing but also dangerous．While working in space, spacemen are facing danger as well as success．

　　Scientists have found out that the radiation(輻射)is the greatest danger to spacemen in space．When spacemen are working in space, they are in danger of the radiation from the sun and other stars, which is bad for their health．The harm of the radiation won't be found until their children even grandchildren are born．Some special medicine may work a little, but no really effective medicine has been found so far．

　　Space rubbish is also thought to be a great danger to spacemen．It's reported that there were 9,000 man-made things flying in space．About 30％ of these are satellites, 10％ are spaceships, and the rest are space rubbish．An explosion(爆炸)in space in 1999 made a cloud of 300,000 fragments, each at least 4mm in size．A small piece of these even knocked a spaceship window and caused some damage．

　　Scientists are watching and reporting any possible danger all the time．They are working to deal with space rubbish．Although space is really dangerous, it interests many people on the earth．In the near future, it may become possible for people to spend a few days in a space hotel．We may even choose to leave the earth and live in space in a few years．So we should do something to help improve the space environment．

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閱讀下列短文，從每題所給的A、B、C、D四個選項中選出最佳選項。

　　Our surroundings(環境)are being polluted faster than nature and man's present efforts cannot prevent it．Time is bringing us more people, and more people will bring us more industry, more cars, larger cities, and the growing use of man-made materials．

　　What can explain and solve this problem? The fact is that pollution is caused by man, by his desire for a modern way of life．We make“increasing industrialization”(工業化)our chief aim．So we are often ready to offer everything：clean air, pure water, good food, our health and the future of our children．There is a constant flow of people from the countryside into the cities, eager for the benefits of our modem society．But as our technological achievements have grown in the last twenty years, pollution has become a serious problem．

　　Isn't it time we stopped to ask ourselves where we are going and why? It makes one think of the story about the airline pilot(飛行員)who told his passengers over the loudspeaker, “I’ve some good news and some bad news．The good news is that we’re making rapid progress at 530 miles per hour．The bad news is that we’re lost and don't know where we’re going．” The sad fact is that this becomes a true story when spoken of our modern society．

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