题目内容
如图，检测10个排球，其中超过标准质量的克数记为正数，不足的克数记为负数，若设一个排球的标准质量为265克．从轻重的角度看，哪个排球与标准重量偏差最大？
解：根据图形可得与标准质量的差的绝对值最大为3.5，所以与标准质量相差为－3.5的球偏差最大．
_______ we know, hurricane is _______ to come.
A. As soon as; possible B. As long as; probable
C. As far as; likely D. As well as; perhaps
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”(超大质量黑洞). 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
____once a year by fire officials, whether a school is large of small, is a regulation that must be carried out in this country.
A. Inspected B. Being inspected
C. Inspecting D. Having been inspected
To land, foreign fishing ships will have to request permission from ports that are able to _____ them.
A. inspect B. attack C. ignore D. contain
The tanker，which was full of petrol，________and gave off heavy and dark flames the moment a truck knocked into it.
A．blew up B．put up C．turned up D．brought up
Is it Shakespeare Theatre _______ you are going to watch the play The Merchant of Venice?
A. swheres B. that C. which D. as
Life is like a tale. ________ matters is not how long it is, but how good it is.
A．Which B．That C．What D．Whose
某种中草药含甲、乙、丙、丁四种草药成分，这四种草药成分的质量比是0.7∶1∶2∶4.7现在要配制这种中药1400克，这四种草药分别需要多少克？设每份为x克，根据题意，得________．
