2. 外语
  3. Trees should only be pruned (修剪, 整枝) when there is a good and clear reason for doing so and, fortunately, the number of such rea

Trees should only be pruned (修剪, 整枝) when there is a good and clear reason for doing so and, fortunately, the number of such rea

admin2012-07-17  33
问题     Trees should only be pruned (修剪, 整枝) 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 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 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 that risk of death as far as possible. It is essential to make the wound on the tree 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 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.
Trees become unhealthy if the gardener______.
选项 A、damages some of the small side branches
B、forces them to grow too quickly
C、does not protect them from the wind
D、allows too many branches to grow in the middle
答案D
解析 本题是一道具体细节题。问如果园丁怎样做树木就会生病。利用查阅式阅读法，我们可以在文章的第二段的后半部分中找到相关内容。这部分指出，可以通过剪枝增进树的健康，可以砍掉病死枝干或互相摩擦的树枝以防磨伤。将生长在树中央阻碍空气流通的枝条剪掉可以有利于树的健康。因此，本题的正确答案应是D“听任树中间部分的许多树枝任意生长”。
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