大学英语四级阅读理解题
以下是在线为同学们整理的练习题,供各位考生参考。
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 obergrown 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 diseaed 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 itis a wound that will heal. Often there is a race between the healing and the desease 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 hurs 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 yu make will bleed. If this does happen,it is, of course,impossible to paint them properly.
1..Why should pruning be done?
A.To make the tree grow taller. B.To improve the shape of the tree.
C.to get rid of the small ranches . D.To make the small branches thicker.
2..Trees become unhealthy if the gardener__________.
A. giving a tree a special shape and adefinite height
B. removing small side branches and making atree look less thick
C. allowing too many branches to grow in themiddle
D. having a tree surrounded by many othertrees
3..Why is a special material painted on the tree?
A.To help a wound to dry. B.to cover a rough surface.
C.To make a wound smooth. D.To prevent disease entering a wound.
4..A good gardener prunes a tree _________ .
A.several times throughout the year B.as quickly as possible
C.occasionally when necessary D.regularly every winter
5..What was the author’s purpose when writingthis passage?
A.To discuss different methods of pruning.
B.To introduce some common knowledge of pruning.
C.To explain how trees developdisease.
D.To give practical instruction for pruning atree.
-
《只有一个地球》读后感600字 读后感
《只有一个地球》读后感600字_读后感读完一本书以后,相信大家都积累了属于自己的读书感悟,是时候抽出时间写写读后感了。到底应如何写读后感呢?下面是小编整理的《只有一个地球》读后感600字_读后感,仅供参考,希望能够帮助到大家。《只有一个地球》读后感600字_读后...
-
个人教学业务工作总结
个人教学业务工作总结总结就是把一个时段的学习、工作或其完成情况进行一次全面系统的总结,它能使我们及时找出错误并改正,是时候写一份总结了。总结怎么写才能发挥它的作用呢?以下是小编精心整理的个人教学业务工作总结,供大家参考借鉴,希望可以帮助到有需要的朋友...
-
开学典礼老师讲话稿(通用19篇)
在学习、工作生活中,很多情况下我们需要用到讲话稿,讲话稿是应用写作研究的重要文体之一。相信很多朋友都对写讲话稿感到非常苦恼吧,下面是小编精心整理的开学典礼老师讲话稿,欢迎阅读,希望大家能够喜欢。开学典礼老师讲话稿篇1同学们,老师们:大家好。很高兴能够和大...
-
《麦肯锡方法》优秀读后感(精选7篇)
当赏读完一本名著后,相信大家都有很多值得分享的东西,何不静下心来写写读后感呢?那么我们该怎么去写读后感呢?下面是小编帮大家整理的《麦肯锡方法》优秀读后感,希望对大家有所帮助。《麦肯锡方法》优秀读后感篇1最近,因为工作不是很忙,抽空读了一遍《麦肯锡方法》。...