Question

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　　It is ten o'clock at night and you are outside. You can see many stars in the sky. Each star is another sun. The sky is big, and it hag many suns.

　　Our sun is near to us. It warms us and gives us light in daytime. The stars are not near. We can see their light only at night, and they do not warm us.

　　The stars are not all the same. Many stars are quite like our sun. They are the same size, and they have the same colour, yellow. Other stars are bigger or smaller. A “giant(巨人)” star is very, very big. A “dwarf(侏儒)”is a small star—smaller than the sun.

　　Stars have different colours, too. They can be blue, orange, yellow, white or red. There are giants and dwarfs in all these colours. All stars are, of course, very hot. The hottest stars are the blue ones. White stars come next, they are less hot. Then yellow and orange stars are less hot again. Red stars are the least hot, and they are also the oldest stars.

　　Light moves very quickly across the sky, eighteen million (18,000,000)kilometers in a minute. Our nearest star is a red dwarf. Its name is Proxima Centauri ( proxima ＝ nearest), and it gives a weak, red light. We can just see this light. It left Proxima Centauri 4.25 years ago, and now tonight, it is reaching cur eyes. Think about it! In one minute, 18,000,000 kilometres. So, in 4.25 years—well, how many kilometers? You can find the answer yourself.

　　I will just say this: Proxima Centauri is a long way from us.

1．According to the temperatures on stars, the right order from the lowest temperature to the highest is ________.

[　　]

A．red→yellow→white→blue

B．orange→red→blue→white

C．blue→white→yellow→red

D．white→blue→orange→red

2．All the following am right except ________.

[　　]

A．a “dwarf” is smaller than the sun

B．there are dwarfs in different colours

C．a “dwarf” is a small star

D．dwarfs are the least hot

3．How far away is the star Proxima Centauri from us?

[　　]

A．40,208,400,000,000 kilometres.

B．9,460,800,000,000 kilometres.

C．679,140,000,000 kilometres .

D．279,225,000,000 kilometres .

4．When we say “The star Procyon is ‘ten light years’ away.”, we mean ________.

[　　]

A．we can reach the star in ten years

B．we first saw the star ten years ago

C．the light left Procyon ten years ago

D．Procyon has been that far away for ten years

Answer 1

答案：A;D;A;C
解析：