2017年6月大学英语四级考试阅读理解每日一练（10）
距离2017年6月大学英语四级考试还有一个半月的时间，已经报名的同学备考一定要抓紧，不要临时抱佛脚。新东方网英语四级频道为大家整理了英语四级阅读理解每日一练，每天一道题考试不担心。If the population of the earth goes on increasing at its present rate,
there will eventually not be enough resources left to sustain life on the
planet.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 earth will
make it necessary for lus 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 compleetely exhausted
it will be possible to change the atmophere of Venus and so create a new world
almost as large as earth itself. The difficult is that Venus is much hotter than
the earth and there is only a tiny amount of water there.
Sagan proposes that algae organisms that can live in extremely hot or cold
atmospheres and at the same time produce oxygen,should be bred in condition
similar to those on Venus.As soon as this has been done, the algae will be
placed in small rockets. Spaceship will then fly to Venus and fire the rockets
into the atmosphere .In a fairly short time, the alge will break down the carbon
dioxide into oxygen and carbon.
When the algae have done theri work, the atmosphere will become cooler,but
befor man can set foot on Venus it will be neccessary for the oxygen to produce
rain. The surface of the planet will still be too hot for man to land on it but
the rain will eventually fall and in a few years something like earth will be
reproduced on Venus.
1.Inte long run, the most insoluble problem caused by population growth on
earth will probably be the lack of ______.
a.food
b.oil
c.space
d.resources
2.Carl Sagan believes that Venus might be colonized from earth because
_____
a.it might be possible to change its atmosphere
b.its atmosphere is the same as the earth's
c.there is a good supply of water on Venus
d.the days on Venus are long enough
3.On Venus there is a lot of ________.
a.water
b.carbon dioxide
c.carbon monoxide
d.oxygen
4.Algae are plants that can____.
a.live in very hot temperatures
b.live in very cold temperatures
c.manufacture oxygen
d.all of the above
5. Man can land on Venus only when_______.
a.the algae have done their work
b.the atmosphere becomes cooler
c.thereis oxygen
d.it rains there
答案：cabdd
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