Can you imagine astronauts' everyday life in space? They also need to eat,  sleep, exercise and relax. They do the same things as us, but they do them differently.
On Earth, we put food on a plate. Gravity holds the food down and keeps it on a place. But there is almost no gravity in space, so food can float （漂浮）away, and astronauts must eat carefully.
Sleeping is very different in space. Some astronauts like to float in the air, but most like to be in a sleeping bag. They tie the bag to a wall so that they won't float away at night.
Exercise is very important in space. On Earth,  your legs carry your body,  but in space, astronauts float, so they do not use their legs often. This is very bad for their legs, so they must exercise for thirty minutes every day.
After a day's work, astronauts relax. They may listen to music, read, watch films, play games, or talk to their friends and families on the radio. Sometimes they just enjoy floating in the air.
【小题1】What does the underlined word "gravity" mean in Chinese?

Can you imagine astronauts' everyday life in space? They also need to eat,  sleep, exercise and relax. They do the same things as us, but they do them differently.

On Earth, we put food on a plate. Gravity holds the food down and keeps it on a place. But there is almost no gravity in space, so food can float （漂浮）away, and astronauts must eat carefully.

Sleeping is very different in space. Some astronauts like to float in the air, but most like to be in a sleeping bag. They tie the bag to a wall so that they won't float away at night.

Exercise is very important in space. On Earth,  your legs carry your body,  but in space, astronauts float, so they do not use their legs often. This is very bad for their legs, so they must exercise for thirty minutes every day.

After a day's work, astronauts relax. They may listen to music, read, watch films, play games, or talk to their friends and families on the radio. Sometimes they just enjoy floating in the air.

1.What does the underlined word "gravity" mean in Chinese?

2.Why do astronauts tie the sleeping bag to a wall?

3.What's the main idea of the passage?

Can you imagine astronauts' everyday life in space? They also need to eat,  sleep, exercise and relax. They do the same things as us, but they do them differently.
On Earth, we put food on a plate. Gravity holds the food down and keeps it on a place. But there is almost no gravity in space, so food can float （漂浮）away, and astronauts must eat carefully.
Sleeping is very different in space. Some astronauts like to float in the air, but most like to be in a sleeping bag. They tie the bag to a wall so that they won't float away at night.
Exercise is very important in space. On Earth,  your legs carry your body,  but in space, astronauts float, so they do not use their legs often. This is very bad for their legs, so they must exercise for thirty minutes every day.
After a day's work, astronauts relax. They may listen to music, read, watch films, play games, or talk to their friends and families on the radio. Sometimes they just enjoy floating in the air.

1. 1.

   What does the underlined word "gravity" mean in Chinese?

   1. A.
      平衡
   2. B.
      引力
   3. C.
      磁性
   4. D.
      重力
2. 2.

   Why do astronauts tie the sleeping bag to a wall?

   1. A.
      Because in that way they won't float away.
   2. B.
      Because that makes them sleep well.
   3. C.
      Because they can't get to sleep if they don't do that.
   4. D.
      Because the sleeping bag is not safe enough.
3. 3.

   What's the main idea of the passage?

   1. A.
      It is about the importance of gravity.
   2. B.
      It is about astronauts' everyday life in space.
   3. C.
      It is about the differences between space and Earth.
   4. D.
      It is about how to avoid （避免） floating away while sleeping.

阅读短文，根据要求完成下面各小题。

When astronauts are in space, they eat, sleep, wash, work and play. 3 They do the same things as us, but they do them differently. 

On Earth, we put food on a plate and water in a glass. Gravity (引力) holds the food down and keeps the water in the glass. But in space, there is almost no gravity. So food can float(漂浮) away, and astronauts must eat and drink carefully.

Sleeping is very difficult in space. Some astronauts like to float in the air, but most like to be in a sleeping bag. They tie（拴）the flag to a wall so that they don’t float away in the night.

Washing is difficult. There is no shower or bath, so astronauts must use a sponge(海绵), They brush their teeth normally: they don’t want wet toothpaste to float around the spacecraft! 

Exercise is very important in space. On Earth, your legs carry your body, but in space, astronauts float, so they do not use their legs. 4 This is very bad for their legs, so they must exercise for thirty minutes every day. They often use an exercise bicycle for this.

After a day’s work, astronauts relax. They may listen to music, read, watch films, play games, or talk to their friends and families by radio. On the International Space Station, astronauts sometimes race from one end of the station to the other. The most popular pastime is looking out of the window, looking at the space and watching the Earth.

      （一）根据短文内容回答下列问题。

      1. Why does food not float on Earth?

      2. What does most astronauts sleep in when they are in space?

（二）将短文中划线的句子译成汉语。

      3.                                                                 

      4.                                                                 

      （三）请给短文拟一个适当的标题。

       5.