Africa is actually connected with Asia at the spot the Suez Canel was dug. A. when B. where C. which D. and 题目和参考答案——青夏教育精英家教网—

题目内容

Africa is actually connected with Asia at the spot ___ the Suez Canel was dug.

A. when B. where C. which D. and

解析:

where引导定语从句修饰the spot.

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The Migration of Birds

Here is a scientific experiment on the homing of birds, the fact of which are quite certain. A few years ago seven swallows were caught near their nests at Bremen in Germany. They were marked with a red dye on some of their white feathers, so that they could easily been seen. Then they were taken by plane to Croydon, near London. This is a distance of 400 miles.

Then the seven swallows were set free at Croydon. Five of them flew back to their nests at Bremen. How did the birds find their way on that long journey, which they had never made before? That is the great puzzle. It is no good saying that the swallows have a sense of direction. These are just words and explain nothing. We want to know exactly what senses the animals use to find their way, how they know in which direction to go until they can see familiar landmarks. Unfortunately practically no scientific experiments have yet been made on this question.

Perhaps migrating birds are the greatest mystery of all. Swallows leave England in August and September, and they fly to Africa, where they stay during our winter. The swallows return to England in the late summer for the south. A lot has been found about the journeys of migrating birds by marking the birds with aluminum rings put on one leg. An address and a number is put on the ring.

Swallows from England go as far as South Africa and as many as fourteen birds, marked with rings in England, have been caught again in South Africa. From England to South Africa is a journey of 6,000 miles. And the birds not only return from Africa to England next spring, but often they come back to the nests in the very same house where they nested the year before.

17．The seven swallows were marked on some of their feathers because .

A．they would be taken away by plane

B．they would be free in London

C．Croydon was 400 miles away

D．they could easily be seen for the red colour

18．Which of the following is true? .

A．Seientists have found why the animals can see their nests.

B．No one knows why the swallows can fly back to their familiar landmarks.

C．It’s very simple that the birds use sense of direction.

D．Many experiments have been made on how birds can fly their way home

19．Swallows like to spend ”our winter” in .

A．England B．London C．Africa D．Germany

20．When do the birds return from South Africa to England every year?

A．summer B．spring C．winter D．Both A and B

The population of Africa is __________ so rapidly as to cause great concern of the whole world.

A. expanding B. stretching C. extending D. spreading

The rapid growth of cities worldwide over the next two decades will cause significant risks to people and the global environment, according to analysis.

Researches from Yale and Stanford predict that by 2030 urban areas will expand by 590,000 square miles—nearly the size of Mongolia—to meet the needs of 1.47 billion more people living in urban areas.

“It is likely that these cities are going to be developed in places that are the most biologically diverse,” said Karen Seto, a famous scientist at Yale University. “They are going to be growing and expanding into forests, biological hotspots, savannas(热带稀缺大草原), coastlines—sensitive and vulnerable places.”

Urban areas, they found, have been expanding more rapidly along coasts. “Of all the places for cities to grow, coasts are the most sensitive. People and buildings along the coast are at risk of flooding and other environmental disasters,” said Seto.

The study provides the first estimate of how fast urban areas globally are growing and how fast they may grow in the future. “We know a lot about global patterns of urban population growth, but we know significantly less about how urban areas are changing,” she said. “Changes in land cover associated with urbanization lead to many environmental changes, from habitats loss and agricultural land conversion(转化) to changes in local and regional climate.”

The researchers examined studies that used satellite data to map urban growth and found that from 1970 to 2000 the world’s urban footprint had grown by at least 22,400 square miles—half the size of Ohio.

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Half of urban land expansion in China is driven by a rising middle class, whereas the size of cities in India and Africa is driven primarily by population growth. “Rising incomes translate into rising demand for bigger homes and more land for urban development, which has a great effect on biodiversity conservations, loss of carbon sinks and energy use.”

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A．forest B．desert C．savannas D．coastline

2.The underlined word “vulnerable” (in Para. 3) probably means “____”.

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A．urbanization is a good way to improve people’s standards of living

B．cities develop very fast and more and more people come to live in cities

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Group buying is one of the fastest growing trends in South Africa today. Industry leaders are confident the growth potential remains strong since group buying is location-specific. Start-up costs are low and profit room remains high, so many sites continue to receive invested money despite widespread criticism and Facebook’s decision to phase out of deal business due to privacy concerns.

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B．China and India are in difficult economic conditions

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阅读下面短文，在文中空白处填入最适当的词语，使文章完整。（每空限填一词。）

Dear Toby,

Your trip sounds exciting! I can’t wait to hear ___1.___ Africa is like.

Since my last letter to you, I have had a little adventure of my own. Early this morning, my mother and I took ____2.___ flight to Dunhuang, in the north-west of China. The desert out there was really quite amazing—I had never seen ___3.____ much sand in my life! While we were there, we arranged with a tour company to ride camels. I was really excited because this was the first time I had seen____4.___ up close. We had hoped that we could see some other wildlife on our trip, ___5.____ sadly we didn’t.

Since you are going to the Sahara, I have some advice—be sure to bring a large hat and a shirt with long sleeves—you’ll need these ____6.___ protection. The sun can be so brilliant that you’ll need to keep covered, ___7.____ you’ll get burnt—my cheek were red for days after my trip. And another thing, you’ll need to keep a good supply of water with you, since it is so dry and hot.

Looking forward ___8.____ receiving your postcards!

Best wishes

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