2021年6月份四级答案 2021年六月份四级答案

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2021年12月大学英语四级阅读理解试题及答案

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2021年12月大学英语四级阅读理解试题及答案（4）

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 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 ________

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

参考答案：cabdd

2021年英语四级考试时间

2021年上半年英语四级考试时间：6月17日

2021年下半年英语四级考试时间：12月16日

9：00——11：20

8：40——9：00 试音时间

9：00——9：10 阅读考场注意事项，发放考卷，贴条形码

9：10——9：40 作文考试阶段

9：40——10：05 听力测试

10：05——10：10 考试暂停5分钟，收答题卡1(即作文和听力)

听力结束后完成剩余考项(阅读和翻译)

11：20全部考试结束。

2021年12月大学英语四级真题及答案解析(全三套)

2017英语四级真题

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