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.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:b a b c a
体坛英语资讯:10-man Iran draw S. Korea in 2018 World Cup qualifier
为什么万圣节要吃糖果?
国际英语资讯:U.S. orders closure of Russian consulate in San Francisco
日本引入了包括埃博拉在内的5种致命病毒
国内英语资讯:China conducts first around-the-world integrated maritime research
英国王室支持率调查:查尔斯垫底,威廉第一
朝鲜发射一枚飞越日本的导弹,引起关注
国际英语资讯:Interview: Britain needs to come to terms with Brexit divorce bill: experts
体坛英语资讯:Four Chelsea players called up for Englands Euro qualifiers
关于霜降,你需要知道这些事
国内英语资讯:China calls for cooperation on fighting global climate change
国际英语资讯:Feature: Chinese naval hospital ship brings free medical services to Djiboutis villagers
The Changes of Raising a Pet 养宠物带来的改变
研究发现:拍照能增强人们对生活的记忆
国内英语资讯:Political advisors brainstorm targeted poverty relief
体坛英语资讯:Osaka, Tsitsipas through to China Open quarterfinals
体坛英语资讯:Lin Dan claims hard-fought opening victory at National Games
川普:针对朝鲜导弹试射,不排除任何选项
国际英语资讯:UN Security Council condemns DPRK missile launch
The Second Child 二胎
国际英语资讯:Spotlight: 3rd round Brexit-talk turns to be Groundhog week with no decisive progress as usu
饭后犯困是因为吃饱?真相震惊到了我!
喀布尔银行外发生自杀袭击,5人丧生
麻将或成为北京冬奥会比赛项目
体坛英语资讯:Dynamo Kiev captain Yarmolenko joins Borussia Dortmund
国际英语资讯:Emergency declared in Pakistans Karachi as heavy rains continue
国际英语资讯:UN chief says dreams to see Gaza part of sovereign Palestinian state
中国“单身经济”迎商机
除了《冰雪奇缘2》 11月上映的这些电影也不容错过
如何用词性转化翻译动词?
不限 |
英语教案 |
英语课件 |
英语试题 |
不限 |
不限 |
上册 |
下册 |
不限 |