六、用括号内所给单词的适当形式填空。
1. We use (telescope) to study the stars.
2. There are many (way) to explore space.
3. The (view) from space is amazing.
4. Astronauts do exercise (keep) strong.
5. They grow (vegetable) on the space station.

1. telescopes 2. ways 3. view 4. to keep 5. vegetables

()1. — can we explore space?
—We can use telescopes.

A.What
B.How
C.Where

1. B

()2. There no living things on Mars.

A.is
B.are
C.was

2. B

()3. Astronauts brush their teeth special toothpastes.

A.with
B.in
C.on

3. A

()4. They can see the sunrise 16 times day.

A.a
B.an
C./

4. A

()5. —Why do astronauts exercise every day?
— they want to stay healthy.

A.So
B.Because
C.And

5. B

八、阅读短文，回答问题。

This is Mars. We call it the “red planet” because its soil is red. It does not have air like Earth. We need a spacesuit(宇航服) if we want to go for a walk there. It is a strange planet. Its surface is warm, but the air just a little way above it can be very cold! Mars has ice at the top, but there is no running water on Mars. We have robots exploring there and maybe one day people will go as well. If you jump up, you will jump three times higher than on Earth. This is because gravity(重力) is about one-third as strong as that on Earth.
1. Why do we call Mars the “red planet”?

2. Where is the ice on Mars?

3. What is exploring Mars at the moment?

1. Because the soil on Mars is red.
2. The ice is at the top of Mars.
3. Robots are exploring Mars at the moment.