选修7

　　Unit 5

　　Travelling

　　abroad

　　能力演练

　　一、语法填空

　　If the population of the Earth keeps on

　　1

　　(increase)at its present rate,there will

　　2

　　(event)not be enough resources left to support life on the planet.By the middle of the 21st century,if present trends continue,we

　　3

　　(use)up all the oil that drive our cars,for example.Even if scientists develop new ways of feeding the human race,the crowded conditions on Earth will make it

　　4

　　(necessity)for us to look for somewhere else.But

　　5

　　of the other planets in our solar system are capable of supporting life at present.One possible solution to the problem,

　　6

　　,hasrecentlybeen suggested by an American scientist,Professor Carl Sagan.Sagan believes that

　　7

　　the Earth,s resources are completely

　　8

　　(exhaust),it will be possible to change the atmosphere of Venus and

　　9

　　create a new world almost as large as Earth itself.Something is difficult.Venus is much hotter than the Earth.

　　10

　　,there is only a tinyamountof water there.

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