live on ②以--为主食 They live on fish and rice. ③靠--生活 He lives on $80 a week. [词汇操练] (根据所给汉语或者首字母——青夏教育精英家教网—

Most of the languages have died out and only one or two of them _______ ,and whether the _______ language can live on remains _______．

[　　]

A．

remains; remained; to see

B．

remains; remaining; to be seen

C．

remains; remaining; to see

D．

remains; remained; to be see

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阅读理解，阅读下列短文，从每题所给的四个选项(A、B、C和D)中，选出最佳选项。

　　Why should mankind explore space? Why should money, time and effort be spent exploring and researching something with so few apparent benefits? Why should resources be spent on space rather than on conditions and people on Earth? These are questions that, understandably, are very often asked．

　　Perhaps the best answer lies in our genetic makeup as human beings．What drove our ancestors to move from the trees into the plains, and on into all possible areas and environments．The wider the spread of a species, the better its chance of survival．Perhaps the best reason for exploring space is this genetic tendency to expand wherever possible．

　　Nearly every successful civilization has explored, because by doing so, any dangers in surrounding areas can be identified and prepared for．Without knowledge, we may be completely destroyed by the danger．With knowledge, we can lessen its effects．

　　Exploration also allows minerals and other potential resources to be found．Even if we have no immediate need of them, they will perhaps be useful later．Resources may be more than physical possessions．Knowledge or techniques have been acquired through exploration．The techniques may have medical applications which can improve the length or quality of our lives．We have already benefited from other spin-offs including improvements in earthquake prediction, in satellites for weather forecasting and in communications systems．Even non-stick pans and mirrored sunglasses are by-products of technological developments in the space industry．

　　While many resources are spent on what seems a small return, the exploration of space allows creative, brave and intelligent members of our species to focus on what may serve to save us．While space may hold many wonders and explanations of how the universe was formed or how it works, it also holds dangers．The danger exists, but knowledge can help human being to survive．Without the ability to reach out across space, the chance to save ourselves might not exist．

　　While Earth is the only planet known to support life, surely the adaptive ability of humans would allow us to live on other planets．It is true that the lifestyle would be different, but human life and cultures have adapted in the past and surely could in the future．

(1)

What is the reason for exploring space based on Paragraph2?
[　　]
A．	Humans are nature-born to do so．
B．	Humans have the tendency to fight．
C．	Humans may find new sources of food．
D．	Humans don't like to stay in the same place．

(2)

The underlined word “spin-offs” in Paragraph 4 probably refers to ________．
[　　]
A．	survival chances
B．	potential resources
C．	unexpected benefits
D．	physical possessions

(3)

What makes it possible for humans to live on other planets?
[　　]
A．	Our genetic makeup．
B．	Resources on the earth．
C．	The adaptive ability of humans．
D．	By-products in space exploration．

(4)

Which of the statements can best sum up the passage?
[　　]
A．	Space exploration has created many wonders．
B．	Space exploration provided the best value for money．
C．	Space exploration can benefit science and technology．
D．	Space exploration may help us avoid potential problems on Earth．

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　　Is there life on Mars（火星）? We do not know. But we are sure that earth people do not live on Mars. Earth people need oxygen to breathe. There is almost no oxygen on Mars. It is uncertain exactly how life arose on Earth, so it is difficult to determine how common such mechanisms are. But if life also arose on Mars, this would show that those mechanisms operated not just once, but twice, arguing that life may well be common elsewhere.

　　Living on Mars would be like living on a very high mountain. There would be little air. It might be 50 degree above zero at noon and 100 degree below zero at night.

　　Many people think there may be plants on Mars. We know that Mars has carbon. This is a kind of material found in all plants and animals on earth. Through a telescope, Mars looks red. In some places, it seems gray. At times, the gray colour turns gray--green, then brown, then gray again. The gray-green colour may be a kind of plant life changing colour with seasons.

　　Mars is a spectacular（引人入胜）place, and will remain so even if it is finally proved to be lifeless. Today, we don't know for sure if there is or ever was life on Mars. But one thing is certain--one day, there will be.

　　Will man go to Mars one day? If they do, they will have to take along their own oxygen, food, clothing, and shelter（住所）.

(1)What do you think is the main reason why men can't live on Mars? Because ________ .

[　　]

A．living on Mars is like living on a high mountain

B．here is no oxygen on Mars

C．there are not any plants or animals on Mars

D．on Mars it is too hot at noon and too cold at night

(2)The story does not say this, but from what we have read, we can tell that ________ .

[　　]

A．someday we may know if there is life on Mars

B．men must take food and clothing with them when they go to Mars

C．people on Mars need no air to breathe

D．the plants on Mars are red

(3)The main idea of the whole story is that ________ .

[　　]

A．there may be life on Mars

B．earth people could live on Mars

C．Mars turns its colour with seasons

D．man will one day land on Mars

(4)Which of the following does this story lead you to believe? ________ .

[　　]

A．Some earth people have already visited Mars

B．There is a lot of oxygen and carbon on Mars

C．There may be strange forms of life on Mars

D．Mars is earth people's future home 查看习题详情和答案>>

根据短文内容，从短文后的七个选项中选出正确的填入空白处。选项中有两项为多余选项。

Urbanization

　　Until relatively recently, the vast majority of human beings lived and died without ever seeing a city．The first city was probably founded no more than 5,500 years ago．　　1　　 In fact, nearly everyone lived on farms or in tiny rural(乡村的)villages．It was not until the 20th century that Great Britain became the first urban society in history－a society in which the majority of people live in cities and do not farm for a living．

　　Britain was only the beginning．　　2　　．The process of urbanization－the migration(迁移)of people from the countryside to the city－was the result of modernization, which has rapidly transformed how people live and where they live．

　　In 1990, fewer than 40％ of Americans lived in urban areas．Today, over 82％ of Americans live in cities．Only about 2％ live on farms．　　3　　．

　　Large cities were impossible until agriculture became industrialized．Even in advanced agricultural societies．It took about ninety-five people on farms to feed five people in cities．　　4　　．Until modern times, those living in cities were mainly the ruling elite(精英)and the servants, laborers and professionals who served them．Cities survived by taxing farmers and were limited in size by the amount of surplus food that the rural population produced and by the ability to move this surplus from farm to city．

　　Over the past two centuries, the Industrial Revolution has broken this balance between the city and the country．　　5　　．Today, instead of needing ninety-five farmers to feed five city people, one American farmer is able to feed more than a hundred non-farmers．

A．That kept cities very small．

B．The rest live in small towns．

C．The effects of urban living on people should be considered．

D．Soon many other industrial nations become urban societies．

E．But even 200 years ago, only a few people could live in cities．

F．Modernization drew people to the cities and made farmers more productive．

G．Modern cities have destroyed social relations and the health of human beings．

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阅读理解

　　Why should mankind explore space? Why should money, time and effort be spent exploring and researching something with so few apparent benefits? Why should resources be spent on space rather than on conditions and people on Earth? These are questions that, understandably, are very often asked．

　　Perhaps the best answer lies in our genetic makeup(基因构成)as human beings．What drove our ancestors to move from the trees into the plains, and on into all possible areas and environments? The wider the spread of a species, the better its chance of survival．Perhaps the best reason for exploring space is this genetic tendency to expand wherever possible．

　　Nearly every successful civilization has explored, because by doing so, any dangers in surrounding areas can be identified and prepared for．Without knowledge, we may be completely destroyed by the danger．With knowledge, we can lessen its effects．

　　Exploration also allows minerals and other potential(潜在的)resources to be found．Even if we have no immediate need of them, they will perhaps be useful later．Resources may be more than physical possessions．Knowledge or techniques have been gained through exploration．The techniques may have medical applications which can improve the length or quality of our lives．We have already benefited from other spin-offs including improvements in earthquake prediction, in satellites for weather forecasting and in communications systems．Even non-stick pans and mirrored sunglasses are by-products(副产品)of technological developments in the space industry!

　　While many resources are spent on what seems a small return, the exploration of space allows creative, brave and intelligent members of our species to focus on what may serve to save us．While space may hold many wonders and explanations of how the universe was formed or how it works, it also holds dangers．The danger exists, but knowledge can help human being to survive．Without the ability to reach out across space, the chance to save ourselves might not exist．

　　While Earth is the only planet known to support life, surely the adaptive ability of humans would allow us to live on other planets．It is true that the lifestyle would be different, but human life and cultures have adapted in the past and surely could in the future．

(1)

Why does the author mention the questions in Paragraph1?
[　　]
A．	To express his doubts．
B．	To compare different ideas．
C．	To introduce points for discussion．
D．	To describe the conditions on Earth．

(2)

What is the reason for exploring space based on Paragraph2?
[　　]
A．	Humans are nature-born to do so．
B．	Humans have the tendency to fight．
C．	Humans may find new sources of food．
D．	Humans don't like to stay in the same place．

(3)

The underlined word "spin-offs" in Paragraph 4 probably refers to _________．
[　　]
A．	survival chances
B．	potential resources
C．	unexpected benefits
D．	physical possessions

(4)

What makes it possible for humans to live on other planets?
[　　]
A．	Our genetic makeup．
B．	Resources on the earth．
C．	The adaptive ability of humans．
D．	By-products in space exploration．

(5)

Which of the statements can best sum up the passage?
[　　]
A．	Space exploration has created many wonders．
B．	Space exploration provided the best value for money．
C．	Space exploration can benefit science and technology．
D．	Space exploration may help us avoid potential problems on Earth．

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