阅读理解

　　The Great Wall of China, the longest wall in the world, runs across north China like a huge dragon. It winds its way from west to east, across deserts over mountains, through valleys, till at last it reaches the sea. It in one of the wonders of the world. And it was one of the few man-made objects on earth that could be seen by the astronauts who landed on the moon.

　　The Great Wall has a history of over twenty centuries. The first part of it was built during the Spring and Autumn Period (770 B. C～476 B. C.). During the Warring States Period (475 B. C.～221 B.C.), more walls were put up to defend the borders of the different kingdoms. In 221 B. C. the kingdom of Qin united the different parts of China into one empire. To keep the enemy out of his empire, Emperor Qin Shihuang had all the walls joined up. Thus the Great Wall came into being. Since then, it has often been added to, rebuilt and repaired, especially during the Ming Dynasty (1368 ～1644).

　　The Great Wall, which is called in Chinese “The Ten-thou-sand-li Great Wall”, is actually more than 6000 kilometers long, 6～7 meters high and 4～5 meters wide. In most places it is wide enough for five horses or ten men to walk side by side along the top. It has great gateways which connect the main roads of north China.

　　Every few hundred meters along the wall there are watch towers, where soldiers used to keep watch. When the enemy came, fires were lit and at the same time guns were fired to warn soldiers at other towers, one column of smoke with one gunshot meant an enemy troop of about 100, two columns with two shots meant 500. In this way, a warning message could be sent 500 kilometers within a few hours.

　　It was very difficult to build and rebuilt such a great wall over wild and distant country without any modern machines, all the work had to be done by hand. Many people were forced to work in the wall far away from their homes. They lifted earth in baskets, passed bricks from hand to hand and dragged heavy stones with ropes over their shoulders. Their living conditions were terrible. Thousands of men died and were buried under the wall they built. The Great Wall was made not only of stone and earth, but of the flesh and blood of millions of men.

　　After the Great Wall was rebuilt hundreds of years ago, no more work was done on it until the People's Republic of China was founded. After that, parts of the wall were repaired. On both sides of it new cities appeared, trees were planted, and deserts became grasslands. The old Great Wall took on a new look.

　　Today the Great Wall has become a place of interest not only to the Chinese people, but also to the people from all over the world.

1．We say the Great Wall of China is like a huge dragon because ________.

[　　]

A．it is one of the wonders of the world

B．it is the longest wall in the world

C．it is the longest wall in the world and runs across north China

D．it is designed according to the form of a dragon

2．About the coming into being of the Great Wall the right order is ________.

During the Spring and Autumn Period the first part was built.

To defend the borders of the different kingdoms more walls were put up.

The different parts of China were united into one empire by the Kingdom of Qin in 221 B. C..

Qin Shihuang had all the walls joined up.

[　　]

A．

B．

C．

D．

3．Which statement is not true?

[　　]

A．The Great Wall is called: The Ten-thousand-li Great Wall though it is more than 6000 kilometers long.

B．It's wide enough for 5 men or ten horses to walk side by side along the top.

C．The Great Wall has great gateways connecting the main roads of north China.

D．There are watch towers along the wall, where soldiers used to keep watch.

4．About the new look of the Great Wall ________ is not right.

[　　]

A．the whole Great Wall were repaired

B．new cities appeared on both sides of it

C．deserts became grasslands

D．trees were planted

5．The right order of the things happened during building the Great Wall is ________.

all work has been done by hand

there were no modern machines

people's living conditions are bad

thousands of men died and were buried under the wall they built

[　　]

A．

B．

C．

D．

阅读下列短文，从每题所给的四个选项中选出最佳选项。

　　In 1620，about half the USA was covered by forests，and in 1850，only about a third．Today a lot of good land has gone with them，leaving only wilder－ness or areas with poor soil．What's worse，too many trees ate still being cut down in the USA．

　　Not copying the USA's example，China has built a new“Great Wall” across the northern part of the country．This time，it is a“Great Green Wall” of trees，millions of trees．It will stop the wind from blowing the earth and the sand away．It will stop the sand from moving southward．It has already saved a lot of land．But more“Great Green Walls” need to be built－not only in China but also all over the world．

　　Wang Feng is a worker at Yulin in Shaanxi．With many other people he works on the Great Green Wall．We visited him at his work place among the young trees and asked him bout his work．“Thousands of trees must be planted every year，” he said．“The more，the better．This year alone，we've already planted ten thousand trees．Just look at all these small trees over there on that hill．They were planted five years ago．But now there is a young forest！In a few years'time，we hope to afforest（绿化）those mountains，too！”He pointed to the high bare mountains far away．

　　“Was it difficult to work on the Great Green Wall？”We asked him thought-fully．

　　“Yes．It's hard work，but it's very important．The only problem is that you can't feed on trees！So we grow our own food，too．We can do it easily now，thanks to the Great Green Wall．”

1．Forests are becoming more and more scarce（稀少）in the USA because

[　　]

A．land is getting poorer and poorer

B．modern agriculture and industry develop too quickly

C．no ways have been found to stop pollution

D．people there have destroyed them during these 350 years

2．China has built a“Great Green Wall” ________．

[　　]

A．in order to keep wind and sand off land and environmental protection in general

[　　]

B．so as to save the desert

C．so that the forests cannot go any longer

D．only to stop the wind from blowing the soil away

3．This text mainly tells us ________．

[　　]

A．about the information of forests in the USA and the PRC

B．that more and more“Great Green Walls”are needed in the world

C．how the Great Green Wall came about

The ocean bottom, a region nearly 2.5 times greater than the total land area of the Earth, is even today largely unexplored. Until about a century ago, the deep-ocean floor was completely inaccessible and hidden beneath waters averaging over 3,600 meters deep. Totally without light and subjected to intense pressures hundreds of times greater than at the Earth’s surface, the deep-ocean bottom is a strange environment to humans, in some ways as forbidding and remote as the outer space.

Although researchers have taken samples of deep-ocean rocks for over a century, the first detailed global study of the ocean bottom did not actually start until 1969, with the beginning of the National Science Foundation’s Deep Sea Drilling Project(DSDP). Using techniques first developed for the offshore oil and gas industry, the DSDP’ s drill ship, the Glomar Challenger, was able to maintain a steady position on the ocean’s surface and drill in very deep waters, taking samples of  rock from the ocean floor.

The Glomar Challenger completed 96 voyages in a 15-year research program that ended in November 1983. During this time, it sailed 600,000 kilometers and took almost 20,000 samples of rocks around the world. Those samples have allowed geologists to reconstruct what the planet looked like hundreds of millions of years ago and to make out what it will probably look like millions of years in the future, Today, largely on the strength of evidence gathered during the Glomar Challenger’ s voyages, nearly all earth scientists agree on the theories of plate tectonics （构造学）and continental drift that explain many of the geological processes.

The samples of rocks drilled by the Glomar Challenger have also provided a climatic record stretching back hundreds of millions of years. The information of past climatic change can be used to predict future climates.

1．What does the underlined word “inaccessible” in line 3 means?

       A．unrecognizable     B．unreachable         C．unusable              D．unreasonable

2．Why does the author mention “outer space” in the first paragraph?

       A．The Earth’s climate millions of years ago was similar to that in outer space.

B．It is similar to the ocean floor in being strange to the humans.

C．Rock formations in outer space are similar to those found on the ocean floor

D．Techniques used by scientists to explore outer space were similar to those used in ocean exploration

3．Which of the following is true of the Glomar Challenger?

A．It is a type of submarine.                     

B．It is an ongoing project.

C．It has gone on over 100 voyages.         

D．It made its first DSDP voyage in 1968.

4．The Deep Sea Drilling Project was sign firent because it was          .

A．an attempt to find new sources of oil and gas

B．the first extensive exploration of the ocean bottom

C．made up of geologists from all over the world

D．supported entirely by the gas and oil industry

5．Which of the following is NOT mentioned in the passage as being a result of the Deep sea Drilling Project?

A．Geologists were able to determine the Earth’s appearance millions of years ago.

B．Two geological theories became more widely accepted by scientists.

C．Geologists observed forms of life never before seen

D．Information was revealed about the Earth’s past climatic changes.