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Passage 8 Trees should only be pruned w
Passage 8 Trees should only be pruned w
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2022-08-02
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问题
Passage 8Trees 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 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 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 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 the branches that are blocking up the center and so preventing the free movement of airOne result of pruning is that an open wound is left on the tree and this provides an easy entry for diseases,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,or that there is a period 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 clearly without the interference(妨碍)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 was the author’s purpose when writing this passage?( )A.To discuss different methods of pruningB.To introduce some common knowledge of pruningC.To explain how trees develop diseaseD.To give practical instruction for pruning a tree
选项
A.To discuss different methods of pruning
B.To introduce some common knowledge of pruning
C.To explain how trees develop disease
D.To give practical instruction for pruning a tree
答案
B
解析
A选项:探讨不同的修剪方式,文章中并没有探讨不同的修剪方式;B选项:介绍了一些修剪常识;C选项:解释树木怎样生病,这只是属于文章的一部分内容;D选项:给出一些修剪树木的实际操作,文章中并没有介绍如何操作。浏览文章脉络可知整个文章都为围绕修剪常识展开的,故正确答案是选项B。
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