19．A.carelessness B．wisdom

　　C．interest D．respect

　　D　[句意：服务员毕恭毕敬地端上咖啡。根据语境可知，空格处应选择和“dignity”同类的词。故答案选D。]

　　20．A.brought down B．took off

　　C．kept away D．cut off

　　B　[句意：这个服务员把墙上的一张纸取下来，扔进垃圾桶里去了。此处指有人消费了一杯免费咖啡后，就应从墙上取下一张。故答案选B。]

　　.阅读理解

　　(2016·辽宁丹东五校联考)If the earth’s population is in growth at this rate，there will not be enough resources.By the middle of the 21st century，if present trends continue，we will have used up all the oil that drives our cars，for example.Even if scientists develop new ways of feeding the human race，the crowded conditions on the earth will make it necessary for us to look for open space somewhere else.But none of the other planets in our solar system are capable of supporting life at present.One possible solution to the problem，however，has recently been suggested by American scientist，Professor Carl Sagan.

　　Sagan believes that before the earth’s resources are completely exhausted it will be possible to change the atmosphere of Venus and so create a new world almost as large as the earth itself.The difficulty is that Venus is much hotter than the earth and there is only a tiny amount of water there.

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