Question: Read the following article and answer the question. Article: After spending years searching for a planet with life, scientists may have found one. In September 2010, a team of US scientists discovered a planet called Gliese 581g. It has a surface temperature neither too hot nor too cold for liquid water. Scientists think there is a chance that the planet could have life. The planet Gliese 581g goes around a star called Gliese 581, which is about 20 light-years from Earth. That is about 194 trillion kilometres -500 million times farther away from us than the moon. A spacecraft traveling at a one-tenth of the speed of light would reach Gliese 581g within about 220 years. A human can't live that long, but robotic explorers could make the job easier. However, our fastest spacec raft don't come anywhere near that one-tenth light-speed mark. At present, scientists don't know what the surface might be like on Gliese 581g. What they know is that the planet is at the right distance from its star to have liquid water. It's also at the right distance to have an atmosphere that could protect the water if it is on the surface. Although spacecraft won't be getting there anytime soon, one way to look for life on Gliese 581g is to turn our radio telescopes towards the planet and search for radiation . By studying the radiation, scientists would find out about the chemicals around the planet and discover if Gliese 581g has an atmosphere. If it has one, studying the atmosphere would give us a good idea whether the planet has life or not. But it'll probably be many years before we can do this properly. People have been arguing about whether there is alien life on Gliese 581g. Any discussion about alien life is just guessing at this point, according to its discoverers. Question: According to the article, Gliese 581g _ . Answer:
OPTIONS:
- is at the right distance from its star
- moves around the earth
- is as far away from us as the moon
- can be reached in about 220 years
Answer: is at the right distance from its star

Question: Read the following article and answer the question. Article: In 1620,about half the USA was covered by forests .Today the forests have almost gone .A lot of good land has gone with them ,leaving only sand .China doesn't want to copy the USA's example.We're planting more and more tress .We've built the "Great Green Wall "of tress across northern pat of our country .The "Great Green Wall"is 7,000 kilometers long ,and between 400 and 1,700 kilometers wide .It will stop the wind from blowing the earth away .It will stop the sand from moving towards the rich farmland in the south .More "Great Green Wall "are needed .Trees must be grown all over the world. "Great Green Wall "will make the world better . ,. Question: Trees must be grown in _ . Answer:
OPTIONS:
- China
- the USA
- some countries
- every part of the world
Answer: every part of the world

Question: Read the following article and answer the question. Article: There are four people in my family. They're my grandfather, my parents and me. My grandfather exercises every day. He never uses the Internet. He eats vegetables three times a day, but he hardly ever drinks milk. And he watches TV every night. My father is a taxi driver. He's very busy. He never exercises, but he sometimes use the Internet. He watches TV on Saturday and Sunday evening. He often eats vegetables and drinks milk. My mother is a housewife . She watches TV every day. She never use the Internet. She sometimes eats vegetables, but she drinks milk three times a week. Exercise? Of course she does. She exercises every day by doing housework. I'm a middle school student. I go to school from Monday to Friday. I often exercise. But on Saturday and Sunday, I don't exercise because I have too much homework to do. I watch TV only on Sunday evening. But I use the Internet twice a week. I drink milk every day, but I don't like vegetables. My mother often says to me, "Why do you eat so much meat, Mike? It's not good for your health." But I like it very much. Question: What does Mike's father do? Answer:
OPTIONS:
- He often eats vegetable.
- He sometimes use the Internet.
- He is very busy.
- He is a taxi driver.
Answer:
He is a taxi driver.