A. they don't have to pay any money

　　B. its faster and cheaper

　　C. they don't need to have stamps, envelopes or addresses

　　D. sending e-mail is interesting

　　( )10. The e in e-mail means .

　　 A. easy B. electrical C. electronic D. enjoyable

　　（C）

　　Man-made Satellites

　　If you watch the sky about an hour after the sun goes down, you may see some moving stars. But they're not real stars. They're man-made satellites（卫星）. And the biggest of all is the International Space Station（简称ISS国际空间站）.

　　From now until July is the best season to watch the ISS flying over the earth. And people can see it with just their eyes.

　　The ISS is the biggest man-made satellite because 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. P-

　　eople will stay and study there with many of the things they have at

　　home. Laboratories, living rooms and power stations （发电站） are

　　being built. The ISS is the most ambitious（雄心勃勃的） and expensive

　　space program ever. Billions of dollars are being spent on it every year.

　　 Scientists hope that the ISS will be a stepping stone（跳板）for future space exploration（探索）.

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