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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