If you watch the sky for about an hour after the sun goes down , you may see some " moving stars". But they're not really stars. They're man—made satellites(人造卫星). And the biggest of all is the International Space Station(ISS). From May to July is the best season to watch the ISS flying over the earth. And people can see it with their eyes.
The ISS is the biggest satellite and scientists want to live on it. They think that the best way to learn more about space is to live there.
When the space station is finished , it will be like a city in space. People will stay and study there with many of the things they have at home. Laboratories, living rooms and power stations are being built. The ISS is the most expensive space program. Billions of dollars are being spent on it every year.
Scientists hope that the ISS will be a stepping stone for future space exploration(探索). "The ISS will help us understand the human body better, explore space and study the earth. It can help us make life on the earth better, " said Kathryn Clark , an ISS scientist.
Sixteen countries are part of the program: the US, Russia, Canada, Japan, Brazil and 11 European countries. China isn't an ISS country , but it has helped with some of the experiments. In 2003 , China sent some rice up to the ISS to find out what space would do to it.
根据材料内容选择最佳答案，并将其标号填人题前括号内。
What is true about the International Space Station?

A．It is a big city in space.

B．It is the biggest man-made satellite.

C．It is a real moving star.

D．People can't see it with their eyes.

From the passage we know that______.

A．the ISS costs less than people expect

B．scientists can do anything they like there

C．the ISS can help us make life in the space better

D．sixteen countries are members of the space program

The underlined phrase "a stepping stone" means " ______" in Chinese.

A．脚步

B．巅峰

C．垫脚石

D．敲砖

China sent some rice up to the ISS in order to______.

A．be used as astronauts' food	B．sell it to aliens
C．do some science experiments	D．make it grow better in space

Where do you most possibly find the passage?

A．A TV guide.	B．A storybook.
C．A science magazine.	D．A travel diary.

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