It is the second-brightest object in our night sky after the moon. It is one of man's the greatest scientific achievements. It's the International Space Station (ISS) that moves around Earth.

Nov 20 is the stations’ 20th birthday. In 1998, the first piece of the ISS was sent into space. Since then, 230 people from 18 countries have visited it. Five space agencies –those of the United States, Russia, Canada, Europe and Japan- worked together to build it. Weighing about 450 tons, it contains many different parts.

Generally, the ISS holds three to six people at one time. Astronauts living there work on a variety of different science projects. The ISS has hosted over 1, 500 such projects, according to NASA(美國(guó)航空航天局) But the station's hardware is aging. In 2011, Russia announced that the ISS will be retired (退役) in 2020 in order to prevent it from becoming dangerous "space junk". However, the US later said it would use repairs to make its service life longer to 2025.

The ISS costs 21-28 billion yuan to operate each year. Many believed that this money could be better spent improving conditions on Earth. In February, US President Donald Trump announced plans to end support for the ISS by 2025. The US will use its money for other projects, like next-generation rockets and deep-space missions.

Although China is not part of the ISS program, it has helped with some of the station's experiments. China will soon have its own space station, becoming the third country after Russia and the US to do so. The station is set to be finished around 2020.

1.How many people have already visited the ISS since 1998?

A.18 B.230 C.450. D.1500

2.According to the US, if it is repaired, how many more years will the ISS serve before it retires?____

A.5 years B.20 years C.22 years D.27 years

3.What do we know about the ISS from this article?

A.The US built the ISS all by itself.

B.The ISS can be used for 20 years

C.China is part of the ISS program and has its space station

D.21-28 billion yuan is spent operating the ISS every year.

4.Which of the following can be the best title for this passage?____

A.Opinions on the ISS B.Brightest Object in Space

C.Facts about the ISS D.How much to Run the ISS

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I never showed my parents my test scores. It’s none of their business!

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