英语四级答案2021年6月 四级英语真题2021年6月

一篇好的文章需要好好的打磨，你现在浏览的文章是一篇关于英语四级答案2021年6月 四级英语真题2021年6月的文章，本文对文章英语四级答案2021年6月 四级英语真题2021年6月好好的分析和解答，希望你能喜欢，只有你喜欢的内容存在，只有你来光临，我们才能继续前行。

2021年12月英语四级真题答案及解析(第三套)

《2017.12四级真题section C》百度网盘免费下载

链接: https://pan.baidu.com/s/1zAG--7oGN7e-ij-1bB0A5A

提取码: sacw

四级真题考试时间已公布,各国家地区考试时间有所不同,大致差不多针对参加考试HSK考试的人,全面提高中文水平,助力通过相应等级的HSK考试。

2021年12月大学英语四级考试真题及答案(三套全)

2017英语四级真题

链接: https://pan.baidu.com/s/1d8rIJD3LSo-70xMjHKhPuA

?pwd=cqat 提取码: cqat

2021年12月大学英语四级阅读理解试题及答案

为你提供“2021年12月大学英语四级阅读理解试题及答案”，希望能帮助到你，更多英语四级考试资讯，网站将持续更新，敬请关注！

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

以上内容是小编精心整理的关于英语四级答案2021年6月 四级英语真题2021年6月的精彩内容，好的文章需要你的分享，喜欢英语四级答案2021年6月 四级英语真题2021年6月这篇精彩文章的，请您经常光顾吧！