题目内容
C
LONDON: What could possibly be wrong with planting trees? The benefits are obvious; they firm the soil, soak up (摄取) extra water and take carbon dioxide (二氧化碳) our of the atmosphere.
However, it now turns out that planting trees could add to global warming.
Tree roots do a great job of keeping soil firmly on the ground and out of the wind’s power. The problem is that some of those dust clouds play an important part in soaking up carbon dioxide.
Huge dust storms blow out over the oceans from dry parts of North Africa and central Asia. Tons of dust are lifted and left as a thin film over the ocean surface. The dust fuels oceanic life.
Dust from China is carried east and left in the Pacific Ocean. If a tree-planting programme there is successful and the dust supply reduced, the net result may be that less carbon dioxide gets locked away in the ocean.
Andy Ridgwell, an environmental scientist from the University of East Anglia, has spent the past few years studying dust and says his work “shows clearly that the complexity of the system and the importance of not tinkering(粗劣地修补) with it without understanding the results. For this reason the need is to focus(集中) on cutting carbon dioxide giving off rather than monkeying (瞎弄) about with the land surface.”
An American scientist, Robert Jackson, has shown that when native grassland areas are invaded(侵入) by trees, carbon is lost from the soil. “We are studying why the soil carbon disappears, but one theory is that trees do a lot more of their growing above ground compared to grasses, so less carbon goes directly into the soil from trees, ” says Jackson.
In wet areas of the world, the gain from trees absorbing carbon dioxide above ground seems to be outweighed(超过) by the loss of carbon from the soil below ground. Countries that plan to combat global warming by planting trees may have to think again.
Solutions to environmental problems are often more complex than they first appear, and understanding the Earth’s climate is a very great challenge.
63.People usually hold the opinion that .
A.huge dust storms can destroy carbon dioxide
B.huge dust storms can destroy the oceans on the earth
C.huge dust storms can’t do anything beneficial for man
D.planting trees is the only way to control huge dust storms
64.Andy Ridgwell, the environmental scientist, believes that .
A.dust plays a more important part than trees
B.trees should’t have been planted in dry places
C.carbon dioxide is harmful to everything on the earth
D.environmental problems are more complex than expected
65.Robert Jackson’s experiment proves that .
A.grassland areas should be covered by forests
B.trees hold more carbon than grasses
C.carbon can turn grass into dust
D.less carbon can make trees grow faster
66.The underlined word “combat” in the last paragraph means .
A.learn about B.fight against C.live with D.give up
63---66 CDBB
解析
You are probably busy preparing for the College Entrance Examination at the moment,but do you have a plan for the three months after?Perhaps you're thinking of traveling. If so,take a look at these three destinations on The New York Times.
Pingyao,Shanxi Province,China The town has remained traditional, banning cars within its 10metertall Ming Dynasty walls and preserving the traditional architecture of courtyard houses and 19th century bank buildings. But the city is becoming known for more than its history. Its yearly photography festival,which takes place in late summer, has attracted enthusiasts and professionals from across the globe for a decade. |
London,The UK There is never a bad time to go to London.But this year may be better than most:the 2012 Summer Olymipic Games provide the greatest appeal to the whole world, and you'll have an unforgettable astonishing experience in London. Besides,travelers can also enjoy special art exhibitions about the Olympics. |
The Danube(多瑙河) The blue Danube threads its way through four capitals(Vienna, Bratislava, Budapest and Belgrade)and touches 10 countries, passing by majestic scenery, great wine regions,castles and ruins dating back centuries. What better way to see all these treasures than from the water? |
1.Which of the following doesn't belong to the features of Pingyao?
A. Traditional architecture. B. 19th century bank buildings.
C. Various cars. D. Photography festival.
2.London of this year is more attractive than most years because________.
A. Olympics are going on here
B. you can experience a completely different culture
C. London's National Portrait Gallery is open to the public
D. you can attend art exhibitions this year
3. From the last paragraph,we know that the Danube________.
A. runs through four countries
B. provides a good way to enjoy beautiful scenery and ancient castles and ruins.
C. is the most valuable river in Europe
D. originates in Viena, Austria
4. The underlined word“majestic”is closest to ________ in meaning.
A. magnificent B. significant C. sensitive D. unattractive
5.Which column do you suppose this passage belongs to?
A. Society B. Economy C. Tourism D. Entertainment