A. needful B. pleasant C. hard D. easy Key: 1-5 DDACB 6-10 BDAAB 11-15 DCCCA 16-20 BDBAC 解析: 查看更多

 

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Money is a needful and precious thing, and when ________, a noble thing, but I never want you to think it is the first or only prize to strive for.

[  ]

A.well used

B.well using

C.to well use

D.being well used

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  Every year farmers in areas which often suffer flood in Southeast Asia lose millions of tons of rice to high water that kills their crops.That large amount of waste may soon be a thing of the past:SUBIA, a gene discovered by researchers which the International Rice Research Insitule(IRRI)and the University of California, allows rice palnts carrying the gene to live completely under water for two weeks.

  Flood–resistant(抗水浸)rice turned up among the 110,000 types of seed stored at the institute.It produced disappointingly low yields(产量), but scientistis were able to transfer the gene into more bountiful varieties.These have shown promising results in tests by growers in India and Bangladesh over the past two years.

  This rice success story would not have been possible without the treasure of genetic diversity hidden in the IRRI's vault(underground room).As the world faces new agricultural challenge – charging climate, bugs and diseases that have developed resistance(抵抗力)to old defenses–such genetic resources are likely to become increasingly valuable.Fortunately, the IRRI is one of more than 1,000 organizations around the world working to protect crop genes.Most plant species grown for food have an associated bank that stores thousands of samples; seeds of landraces, wild relatives, and varieties that are rare, old, or adapted to very specific envionments.The banks ensure that it will be possible to develop new varieties in the future.

  The need for these botanical libraries has its roots in modern agricultural practices.According to the U.N.Food and Agriculture Organization, 75 percent of plant diversity has been lost over the last century.Of more than 30,000 eatable species, humans grow just 200 for food; 60 percent of plant calories in our diet comes from wheat, rice, and corn.

(1)

Accordint to the second paragraph, what can we learn about the flood – resistant rice?

[  ]

A.

It produces a small amount of rice.

B.

Scientists have developed many more varieties of it.

C.

Sientists have managed to improve its output.

D.

It can produce more rice than the other 110,000 types at the institute.

(2)

From the passage we can infer that ________

[  ]

A.

the newly – discovered gene will bring hope to the farmers in the areas often suffering flood

B.

scientists will not be able to change the fact that rice plants carrying the gene produce low yields

C.

the tests by growers in India and Bangladesh were hopeless

D.

110,000 types of seed stored at the Institute are flood-resistant

(3)

What's the main idea of the third paragraph?

[  ]

A.

The world faces new agricultural challenges.

B.

Such genetic resources are likely to become valuable.

C.

Scientists set up banks to store thousands of seed samples.

D.

We should owe the rice success story to the seed banks.

(4)

As to the botanical libraries, the writer thinks they are ________

[  ]

A.

useless

B.

unnecessary

C.

needful

D.

needless

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The temperature is rising again in the Arctic. The sea ice area has dropped to one of the lowest levels on record, climate scientists reported last week.

“The new Arctic Report Card tells a story of widespread and continued effects of a warming Arctic,” said Jackie Richter-Menge of the US’s Cold Regions Research and Engineering Laboratory.

“This isn’t just a climatological (气候学的) effect. It impacts the people that live there,” she added.

Scientists concerned about global warming focus on the Arctic because that is a region where the effects are expected to be felt first, and that has been the case in recent years.

There was a slowdown in Arctic warming in 2009, but in the first half of 2010 warming was near a record pace. The monthly readings were over 4 degrees Celsius above normal in northern Canada, according to the report card. The report card was prepared by 69 researchers in eight countries.

Researchers said last winter’s big snow storms that struck some Northern countries were tied to higher Arctic temperatures.

“Normally the cold air is bottled up in the Arctic,” said Jim Overland of the US National Oceanic and Atmospheric Administration. “But last December and February, winds that normally blow west to east across the Arctic were instead bringing the colder air south,” he said.

“As we lose more sea ice... warming in the atmosphere can create more of these winter storms,” Overland said.

There is a powerful connection between ice cover and air temperatures, Richter-Menge explained. When temperatures warm, ice melts. When ice melts it shows darker surfaces underneath , which absorb  more heat. “That, in turn, causes more melting and on the cycle goes,” she said.

In September the Arctic sea ice extent was the third smallest in the last 30 years, added Don Perovich of the US Army Laboratory. He said the three smallest ice covers have occurred in the last four years.

Scientists care so much about the warming in the Arctic region because     .

A .the climate in the Arctic doesn’t change much

B. global warming effects are most serious in the Arctic region

C .there has been a major decrease of Arctic warming in recent years

D. by studying the region they can make predictions about the future impact of global warming

. Which of the following shows that the Arctic is getting warmer? 

A. The surface of the sea ice in Arctic is getting darker and darker.

B. The Arctic sea ice extent has disappeared over the last 30 years.

C. The sea ice extent has increased to one of the highest levels on record.

What does the underlined word “cycle” refer to?  

A .Ice giving off heat when it melts.

B. Higher temperatures bringing more storms.

C .The cause and the result of the melting.

D. The life of the people living in the Arctic getting worse.

According to researchers what led to big snow storms attacking some Northern countries last winter?                 

A. Higher Arctic temperatures.

B. The melting ice.

C. The cold wind blowing west to east.

D. Cold air bottled up in the Arctic.

What is the main point of the article?         

A. Last winter’s big snow-storms.

B. Winds in the Arctic region.

C. Arctic warming and its possible effects.

D. Changes to the life of people living in the Arctic.

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This watch is _____ to all the other watches on the market.

  A. superior  B. advantageous  C. super D. beneficial

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 He was made _____.

  A. go                B. gone

  C. going               D. to go

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