题型：阅读选择 题类： 难易度：普通
【全效学习】英语八年级下册课时提优学习八年级下册英语A本 Module 3 Unit 2
For thousands of years, humans have explored the earth. Nowadays, we are exploring space. Many astronomers (天 文 学 家) are looking for new planets and new places for humans to live in the future. But where do astronomers start looking?
First, astronomers look for a star(恒星),because our own earth moves around a star. More importantly, it is the correct distance(距离) from the Sun for heat and light. So when astronomers have found the star, they look at the planets around it. In recent years, astronomers have found nearly 400 new planets with stars. However, many of these planets are either too near the star or too far away.
Then, if the planet is in a good position(位置), astronomers look for three key things: water, air and rock. Water is important because all life needs water. And plants produce air for humans to breathe and food to eat. Rock is also important, because there is often water under the rock.
After many years of scrutinising, astronomers have found a planet that is similar to the earth. It's Gliese 581g and it's near a star. The astronomers think it has water and rock. Gliese 581g is bigger than the earth. A year on Gliese 581g is only 37 earth days instead of 365. But astronomers do not think these are big differences and some of them think Gliese 581g will be a new earth.
Hi, my name is Eric. There are four things in my room.
| This is my cap. It's yellow and black. Where's it now? Do you know? Oh, it's in my schoolbag. |
| This is my model plane. It's cool (酷的) , right? I always put it on my bed. But now it is in my bookcase. |
| This nice green schoolbag is mine. My books and notebooks are in it. My pens are in it, too. It's always on the chair. But now it's on the sofa. |
| This nice radio isn't mine. It's my sister Anna's. Now she puts it in my bookcase. But I can't use (用) it. |
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