Farmers, especially in developing countries, are often criticized for cutting down forests. But a new study suggests that many farmers recognize the value of keeping trees.
Researchers using satellite images found at least ten percent tree cover on more than one billion hectares of farmland. That is almost half the farmland in the world. Earlier estimates were much lower but incomplete. The authors of the new study say it may still underestimate the true extent worldwide.
The study found the most tree cover in South America. Next comes Africa south of the Sahara, followed by Southeast Asia. North Africa and West Asia have the least.
The study found that climate conditions alone could not explain the amount of tree cover in different areas. Nor could the size of nearby populations, meaning people and trees can live together. There are areas with few trees but also few people, and areas with many trees and many people. The findings suggest that things like land rights, markets or government policies can influence tree planting and protection.
Dennis Garrity, who heads the World Agroforestry Center, says farmers are acting on their own to protect and plant trees. The problem, he says, is that policy makers and planners have been slow to recognize this and to support such efforts.
The satellite images may not show what the farmers are using the trees for, but trees provide nuts, fruit, wood and other products. They also help prevent soil loss and protect water supplies. Even under drought(干旱)conditions, trees can often provide food and a way to earn money until the next growing season.
Some trees act as natural fertilizers. They take nitrogen(氮?dú)?out of the air and put it in the soil. Scientists at the Center say the use of fertilizer trees can re-duce the need for chemical nitrogen by up to three-fourths. Trees also capture carbon dioxide, a gas linked to climate change.
小題1:Through the study, the researchers found that               .
A.there are more trees on farmlands than expected
B.fewer trees are being cut in developing countries
C.most farmers still don’t realize the value of trees
D.trees play a key role in preventing climate change
小題2:Which of the following has the least tree cover?
A.Southeast AsiaB.West Asia.
C.South America.D.Africa south of the Sahara.
小題3:In Dennis Garrity’s opinion,              .
A.most farmers care about nothing but their own interests
B.there are usually few people living in areas with few trees
C.government plays a small role in tree planting and protection
D.government should support farmers in planting and protecting trees
小題4:The sixth paragraph mainly tells about          .
A.how farmers plant trees
B.what products trees can bring
C.the importance of trees to farmers
D.the environmental value of tree cover

小題1:A
小題2:B
小題3:D
小題4:C

試題分析:文章介紹現(xiàn)在世界上農(nóng)場(chǎng)樹林占有的面積還是很多的,農(nóng)民正意識(shí)到樹木對(duì)人對(duì)環(huán)境的重要性。
小題1:細(xì)節(jié)理解題:從第二段的句子:Earlier estimates were much lower but incomplete. The authors of the new study say it may still underestimate the true extent worldwide.可知早先的估計(jì)樹林面積是低的,不完整的,也就是現(xiàn)在的農(nóng)場(chǎng)的樹林比預(yù)料的要多。所以選A。
小題2:細(xì)節(jié)題:題目問:下面的哪個(gè)地方樹木面積最少?可以根據(jù)這幾個(gè)地方定位到第三段:The study found the most tree cover in South America. Next comes Africa south of the Sahara, followed by Southeast Asia. North Africa and West Asia have the least. 可知West Asia是最少的。選B。
小題3:細(xì)節(jié)題:題目問:Dennis Garrity是怎么認(rèn)為的,根據(jù)Dennis Garrity定位到第五段:Dennis Garrity,….says farmers are acting on their own to protect and plant trees. The problem, he says, is that policy makers and planners have been slow to recognize this and to support such efforts.說明政府應(yīng)該支持農(nóng)民種樹,保護(hù)樹,所以選D。
小題4:段落大意題:題目問:第六段主要講了什么?重點(diǎn)放在第六段,從文章第六段的內(nèi)容,可知講的是樹木對(duì)農(nóng)民的重要性。
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C.By raising questions.D.By making comparisons.
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B.prevent students going into debt
C.help students get accepted by colleges
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B.Having a balanced diet and exercising would probably be a better way to keep healthy.
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D.Taking vitamins to replace or supplement your healthy diet is necessary.
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A.Vitamin supplements have proved harmful to the health of adults.
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D.Daily multivitamins will make you healthier.
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