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

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

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问题  Trees should only be pruned(修剪)when there is a good and clear reason for doing so and，fortunately，the number of such reasons is small．Pruning involves cutting away of  overgrown and unwanted branches，and the inexperienced gardener can be encouraged bv the thought that more damage results from doing it unnecessarily than from leaving the trees to grow in their own ways．
    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 smail 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 heahh of a tree mav be encouraged by removing the branches that are locking 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 easv entry for diseases，but it is a wound that will heal(愈合)．Often there is a race between the healing and the disease as to whether the tree will live or die，or that there is a Deriod when the tree is at risk．  It should be the aim of every gardener to reduce the risk as far as possible．It is essential tO make the area 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 clearlv without the 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．
A good gardener prunes a tree__________．
选项 A、several times throughout the year
B、as quickly as possible
C、occasionally when necessary
D、regularly every winter
答案C
解析 由文章第一句话可知，必要的时候才需要剪枝，但需要剪枝的时候不多。故选C。
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