题目内容

The following sentence is the first sentence of a summary of paragraphs A-D. Please choose three other sentences to complete the summary of “At Home on Mars”.If we want to live on Mars someday, we will have to change it so it is similar to Earth.

A. Wind turbines can produce power using wind energy.
B. We will need to increase the average temperature of Mars.
C. A huge amount of greenhouse gases is making Earth’s atmosphere warmer.
D. Releasing greenhouse gases on Mars will help create a suitable environment.
E. Changing Mars will be a long process, but scientists think we will live there someday.

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Choose words from the article to complete this summary.Mars as a planet is not 1____. There is not enough oxygen to breathe. There is no 2, just ice, and it can get very cold there. Some scientists, however, believe Mars can be terraformed. Perhaps factories could be built to increase the levels of 3_. This would change the atmosphere on Mars. But terraforming Mars would take many centuries and would be expensive.The first step would be to send 4_ missions there. Then homes could be built. Enormous 5 would be required, first for plants, then for people. Perhaps 6_ or wind turbines could be used for power. But even after 1,000 years, people might need to wear equipment similar to 7______ in order to breathe.

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B. 23
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B. 2
C. 3
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