二、人类移居火星或将成为可能。李华在天文馆里的“星际探索动态墙”上看到一篇研究报告。阅读该报告，补全短文。
Stephen Hawking said, “Once we step into space, our future should be safe.”
Now many countries like the USA, Russia and China are building space stations and sending astronauts there today. 1.
G
Robert, a rocket scientist, thinks it is a right thing for the countries to do so. Humans should move to other planets and build new homes there. 2.
F
In the end, we could work and live on other planets. Any improvement we make in science, technology, medicine and health will do good to people here on the Earth.
SpaceX is a company that builds rockets. The CEO Elon Musk also agrees to send humans to Mars. His long-term plan is to put one million people there if some bad things happen to us here on the Earth.
3.
A
Many people say it’s too expensive. Also, most space trips are not short. A one-way trip to Mars would take at least six months. 4.
D
What’s more, the first people would find life terribly difficult in space. On Mars’ surface, the sun’s rays are very dangerous. People would have to stay inside most of the time.
5.
E
As the saying goes, “My conquest(征途)is the sea of stars.” We might see cities or even new human cultures on other planets.
A. Not everyone agrees with it.
B. This could make their countries stronger.
C. It’s impossible for us to realize the dream.
D. People might face many health problems on the way.
E. In the future, sending people into space seems certain.
F. This will help us learn to live in a very different environment first.
G. These stations will prepare humans to visit and live on other planets.
