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单选题
Lichens may NOT grow ______.
A
in the tropical woods
B
on the ceilings of city buildings
C
on rocks in hot springs
D
in dry desserts
参考答案
参考解析
解析：
细节题。文章第一段第一句主要描述lichenon（地衣，苔藓）的生长区域，其中提到了the bark of a tree in a steaming tropical rain forest，on rocks in hot springs和in the driest desserts，分别对应选项A、C、D，而选项B与原文不符，因为该句提到地衣还可能生长在the bricks of big city buildings，brick指的是“砖”，并非B项中的ceilings（天花板）。
细节题。文章第一段第一句主要描述lichenon（地衣，苔藓）的生长区域，其中提到了the bark of a tree in a steaming tropical rain forest，on rocks in hot springs和in the driest desserts，分别对应选项A、C、D，而选项B与原文不符，因为该句提到地衣还可能生长在the bricks of big city buildings，brick指的是“砖”，并非B项中的ceilings（天花板）。
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Trees should only be pruned when there is a good and clear reason for doing so and,
fortunately, the number of such reasons is small. Pruning involves the cutting away of overgrown and unwanted branches, and the inexperienced gardener can be encouraged by the thought that more damage results from doing it unnecessarily than from leaving the tree to grow in its own way.
First, pruning may be done to make sure that trees have a desired shape or size. The object may be to get a tree of the right height, and at the same time to help the growth of small side branches which will thicken its appearance or give it a special shape. Secondly, pruning may be done to make the tree healthier. You may cut diseased or dead wood, or branches that are rubbing against each other and thus cause wounds. The health of a tree may be encouraged by removing branches that are blocking up the centre and so preventing the free movement of air.
One result of pruning is that an open wound is left on the tree and this provides an easy entry for disease, but it is a wound that will heal. Often there is a race between the healing and the disease as to whether the tree will live or die, so that there is a period when the tree is at risk. It should be the aim of every gardener to reduce which has been pruned smooth and clean, for healing will be slowed down by roughness. You should allow the cut surface to dry for a few hurts and then paint it with one of the substances available from garden shops produced especially for
this purpose. Pruning is usually without interference from the leaves and also it is very unlikely that the cuts you make will bleed. If this does happen, it is, of course, impossible to paint them properly.
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C.get rid of the small branches
D.make the small branches thicker
考题
Trees should only be pruned when there is a good and clear reason for doing so and,
fortunately, the number of such reasons is small. Pruning involves the cutting away of overgrown and unwanted branches, and the inexperienced gardener can be encouraged by the thought that more damage results from doing it unnecessarily than from leaving the tree to grow in its own way.
First, pruning may be done to make sure that trees have a desired shape or size. The object may be to get a tree of the right height, and at the same time to help the growth of small side branches which will thicken its appearance or give it a special shape. Secondly, pruning may be done to make the tree healthier. You may cut diseased or dead wood, or branches that are rubbing against each other and thus cause wounds. The health of a tree may be encouraged by removing branches that are blocking up the centre and so preventing the free movement of air.
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this purpose. Pruning is usually without interference from the leaves and also it is very unlikely that the cuts you make will bleed. If this does happen, it is, of course, impossible to paint them properly.
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B.does not protect them from wind
C.forces them to grow too quickly
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共用题干
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单选题Which of the following best expresses the main idea of Paragraph 2?A
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考题
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考题
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Because of their primitive structure.C
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考题
单选题Which of the following can be inferred about the effect of direct sunlight on lichens?A
It damages the algae.B
It helps the fungi absorb water.C
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考题
单选题Trees become unhealthy if the gardener _____.A
allows too many branches to grow in the middleB
does not protect them from windC
forces them to grow too quicklyD
damages some of the small side branches
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