《2025年时代新课程九年级英语下册译林版》

阅读下面的短文，然后根据短文内容，在每小题所给的四个选项中选出最佳选项。
Some of the world’s most important scientists think the idea of people living on Mars will come true one day. Stephen Hawking believed humans must move into space to live. “Once we spread out into space and build independent colonies (独立的殖民地), our future should be safe,” he said. Robert Zubrin, a rocket scientist, agrees and thinks sending people to Mars will allow us to learn a lot — for example, about the ability of humans to live in a very different environment.
★ Terraforming (地球化) means changing the environment on a planet so that it is similar to Earth’s. One of the main goals of terraforming Mars is to warm it up because the average temperature there is about -60°C. One idea for warming Mars is to build factories there that produce greenhouse gases. This could take many centuries. However, it should lead to rainfall and the growth of plants, resulting in more air that people can breathe.
Another big concern for scientists is whether humans can move to Mars and still stay healthy in mind and body. As a test, six people lived in a Mars - like environment in Hawaii for a year before “returning to Earth” recently. It was a 1, 200 - square - foot room that was on the side of a volcano (火山) and used the sun for energy. Christiane Heinicke, one of the people who lived there, said that one of the biggest problems was feeling bored. Another important finding was that the people living together should all be able to get along and work together.
One particular organization based in Europe is planning to send the first humans to Mars before 2030. However, many experts think the project’s cost of 6 billion is too low for it to be successful. The American space agency NASA believes that sending people to Mars would cost about 100 billion, although this estimate is based on bringing them back to Earth, too. Anyway, it seems that humans living on Mars may well happen a lot sooner than most people believe.
( ) 1. Paragraph 1 mainly focuses on ________.
A. how we can move to another planet B. why we work on moving to Mars
C. when we will move to Mars D. where the Mars is
( ) 2. Which of the following can be put in ★?
A. However, scientists need to terraform Mars for people to live.
B. And people are trying to send the people to Mars.
C. But scientists can’t do anything about this.
D. However, it is not easy to move to Mars.
( ) 3. The underlined word “them” refers to ________.
A. humans B. scientists C. planets D. cost
( ) 4. What can we learn from the passage?
A. The temperature on Mars is 60 degrees above zero.
B. It is sure to send the first humans to Mars after 2030.
C. 6 billion is enough to send people to Mars.
D. Moving to Mars would be good for mankind.

答案： 1-4: BAAD