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__________ trees down 焚毁树木, cut trees __________ 砍伐树木
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减少某事物的数量
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单选题What doesn’t the old tree tell us?A
He’s afraid to be cut down somedayB
He has fewer and fewer friendsC
The trees have the longest lives in the worldD
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单选题Why do forests in many parts of the world slowly disappear?A
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Many trees have been cut down by man.C
Man has not paid enough attention to planting trees.D
All of the above.
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单选题Why does land become desert after all trees are cut down?A
Because nothing remains on land except floods.B
Because there are no longer trees to keep the rain and protect the top-soil.C
Because too much rain sinks in and washes away the top-soil.D
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slowed down B
retained C
propelled D
fed
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单选题Countries sometimes spoil their beauty spots because ______.A
they are too poor to build beautiful hotels on themB
they have to cut down trees to build hotels on themC
they have to sell them to borrow money from foreign banksD
they are lacking experience in building hotels
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单选题Prolonged and unseasonable frosts produce frost rings in deciduous trees, which grow in moderate climates. Frost rings do not appear in any of the fossilized deciduous trees that have been found in Antarctica. Hence, it is unlikely that such frosts occurred in Antarctica at the time the fossilized trees lived. Which of the following is an assumption on which the argument depends?A
There are fossilized nondeciduous trees from Antarctica that bear frost rings.B
Deciduous trees are more likely to bear frost rings than are other tree varieties.C
The process of fossilization does not completely obscure frost rings in deciduous trees.D
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