Question

A black hole is a place in space where gravity pulls so much that even light cannot get out. The gravity is so strong because matter has been squeezed into a tiny space. This can happen when a star is dying.

Because no light can get out, people can’t see black holes. Space telescopes with special tools can help find black holes. The special tools can see how stars that are very close to black holes act differently from other ones.

Black holes can be big or small. Scientists think the smallest black holes are as small as just one atom. These black holes are very tiny but have the mass of a large mountain. Mass is the amount of matter, or “staff”, in an object.

Another kind of black hole is called “stellar”(星球黑洞). Its mass can be up to 20 times more than the mass of the sun. There may be many stellar mass black holes in Earth’s galaxy. Earth’s galaxy is called the Milky Way.

The largest black holes are called “supermassive”(超大質(zhì)量黑洞). These black holes have masses that are more than one million suns together. Scientists have found proof that every large galaxy contains a supermassive black hole at its center. The supermassive black hole at the center of the Milky Way galaxy has a mass equal to about four million suns and would fit inside a very large ball that could hold a few million Earths.

Scientists think the smallest black holes formed when the universe began. Stellar black holes are made when the center of a very big star falls in upon itself, or falls apart. When this happens, it exploded part of the star into space. Scientists think supermassive black holes were made at the same time as the galaxy they are in.

A black hole can not be seen because strong gravity pulls all of the light into the middle of the black hole. But scientists can see how the strong gravity affects the stars and gas around the black hole. Scientists can study stars to find out if they are flying around, or orbiting a black hole.

When a black hole and a star are close together, high-energy light is made. This kind of light cannot be seen with human eyes. Scientists use satellites and telescopes in space to see the high-energy light.

1. The gravity of a black hole may become so strong that light cannot get out when_.

A. the star is going to die

B. special tools are used on it

C. other stars come close to it

D. it is seen from the space telescopes

2.According to the passage, which of the following is NOT true?

A. A black hole can be very tiny but extremely heavy.

B. The gravity of a black hole holds all light in its center.

C. Scientists observe high-energy light through their own eyes.

D. Some small black holes came into being as early as the universe.

3.Which can be inferred from the passage?

A. Every galaxy must have a black hole.

B. A galaxy is the center of the universe.

C. A galaxy consists of a large group of stars and planets.

D. Earth’s galaxy is called the Milky Way.

4.What does the last sentence in Paragraph 5 suggest?

A. Neither the sun nor the earth is as heavy as a black hole.

B. There is only one supermassive black hole at the center of the Milky Way.

C. The supermassive black hole had existed before the Milky Way was formed.

D. There is a reason why the large black holes are called “supermassive”.

5.The last two paragraph mainly focus on the question of _________.

A. what a black hole is

B. how black holes form

C. how big black holes are

D. how scientists know about black holes

 

Answer 1

1.A

2.C

3.C

4.D

5.D

【解析】

試題分析：本文主要講述太空黑洞的形成原因和科學(xué)家們?nèi)绾瘟私夂诙船F(xiàn)象的。

1.A推斷題，根據(jù)文章的第一段，特別是關(guān)鍵句This can happen

when a star is dying可知黑洞是因?yàn)樾切堑膿p落造成的。故選A。.

2. C推斷題，根據(jù)文章的最后一段When a black hole and a star are close together, high-energy light is made. This kind of light cannot be seen with human eyes. Scientists use satellites and telescopes in space to see the high-energy light可知科學(xué)家們觀察高能量的星星是通過(guò)望遠(yuǎn)鏡和衛(wèi)星觀察的，不是用肉眼觀察的，故選C。

3.C推斷題。根據(jù)第五段的Scientists have found proof that every large galaxy contains a supermassive black hole at its center可知銀河系是由很多的恒星和行星組成的，故選C。

4.D推斷題。根據(jù)文章倒數(shù)第二段A black hole can not be seen because strong gravity pulls all of the light into the middle of the black hole.和第三段最后一句Scientists think supermassive black holes were made at the same time as the galaxy they are in.推斷有很多理由可以解釋為什么黑洞可以被成為“supermassive”。故選D。

5.D大意題。文章的最后兩段都在說(shuō)明科學(xué)家們是怎么樣了解黑洞現(xiàn)象的，故選D。

考點(diǎn)：科普環(huán)保類閱讀理解