hould 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. Pruning should be done to ________.
a. make the tree grow taller
b. improve the shape of the tree
c. get rid of the small branches
d. make the small branches thicker
2. Trees become unhealthy if the gardener ________.
a. allows too many branches to grow in the middle
b. does not protect them from wind
c. forces them to grow too quickly
d. damages some of the small side branches
3. Why is a special substance painted on the tree?
a. To make a wound smooth
b. To prevent disease entering a wound
c. To cover a rough surface
d. To help a wound to dry
4. A good gardener prunes a tree ________.
a. at intervals throughout the year
b. as quickly as possible
c. occasionally when necessary
d. regular every winter
5. What was the authors purpose when writing this passage?
a. To give pratical instruction for pruning a tree.
b. To give a general description of pruning
c. To explain how trees develop diseases
d. To discuss different methods of pruning.
答案:babca
以上就是查字典大学网为同学们带来的“2016年12月大学英语四级考试阅读理解练习题(九)”内容了,希望看完能够带给大家一些力量,对同学的生活有所启示,更多内容在这里,请继续关注我们。
办公室恋情恶果VS好处
90后求职女生吴丽春:“相信勇敢之后必有春天”
中国的社会保障改革亟须顶层设计
职场为人处世三大准则:爱岗敬业 不卑不亢 自信坦然
创业,会给职业生涯加分多少?
中国IT城市满意度排名
15个细节助你走向美好的职业生涯
中国国际形象最佳城市排名 上海居首
大学生利用过年前短短的十几天兼职
大学生如何弥补自身的求职劣势
彩虹族成职场白领新宠
高校“求职达人” 毕业即获50万年薪 做好职业规划
别把职业规划当成口头禅
2010全球城市排名中国七城市上榜 北京排名十五
新兴职业发展遇瓶颈 或"无地用武"或"有市无人"
大一小伙骑单车37天到拉萨 全程2166公里
关于主动性的三个小故事
职场白领热门电影推荐