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  3. Trees should only be pruned when there is a good and clear reason for doing so and, fortunately, the number of such reasons is s

Trees should only be pruned when there is a good and clear reason for doing so and, fortunately, the number of such reasons is s

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问题     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.
    Firstly, 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 out diseased or dead wood, or branches that are rubbing against each other and thus causing wounds. The health of a tree may be encouraged by removing branches that are blocking up the center 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 that risk of death as far as possible. It is essential to make the area which has been pruned smooth and clear, for healing will be slowed down by roughness.
    You should allow the cut surface to dry for a few hours and then paint it with one of the substances available from garden shops produced especially for this purpose. Pruning is usually done in winter, for then you can see the shape of the tree clearly without interference from the leaves and it is, too, very unlikely that the cuts you make will bleed, if this does happen, it is, of course, impossible to paint them properly.
What is the author’ s main purpose in writing this passage?
选项 A、To describe the advantages of pruning.
B、To give a general description of pruning.
C、To discuss different methods of pruning.
D、To explain the reasons for pruning.
答案D
解析 文章开头提出中心，而后解释了两种情况下可剪除树枝，最后提出修剪的方法。故选D。
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