听第10段独白,回答第18至20题。
(Text 10)
When my interest changed from space to the sea,I never expected that my friends would be so surprised and puzzled.Yet I could understand their feelings.As I have been writing and talking about space flight for the best part of 20 years,a sudden switch of interest to the depth of the sea does seem rather strange.To explain,I’d like to share my reasons behind this unusual change of mind.The first is an economic reason.Underwater exploration is so much cheaper than space flight.The first roundtrip ticket to the moon is going to cost at least 10 billion dollars if you include research and development.By the end of this century,the cost will be down to a few million.On the other hand,the diving suit and a set of basic tools needed for diving can be bought for 20 dollars.My second argument is more philosophical.The ocean,surprisingly enough,has many things in common with space.In their different ways,both sea and space are equally awful environments.To survive in either for any length of
time requires special equipment.The diving suit actually inspired the design of the space suit.
第二部分
21.D 考查交际用语。句意为:你度假的时候要不要我帮你看房子?回答的人应表示感谢,故D项符合题意。
22.D 考查代词。第一空用it确切指代上文提到的那辆漂亮的玩具车;第二空用one表示同类不同物,在句中表示“像上面提到的那样的一辆玩具车”,所以选D项。
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