首页
外语
计算机
考研
公务员
职业资格
财经
工程
司法
医学
专升本
自考
实用职业技能
登录
外语
Trees should only be pruned when there is a good and clear reason for doing so and, fortunately, the number of such reasons is s
Trees should only be pruned when there is a good and clear reason for doing so and, fortunately, the number of such reasons is s
admin
2020-03-30
95
问题
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 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 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 diseased 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 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, so that there is a period when the tree is at risk. It should be the aim of every gardener to reduce that risk of death 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 without interference from the leaves and also it is 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?
选项
A、To give practical 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
A
解析
本文首先指出只有在有益于树木的前提下才应修剪树木;后面举例具体说明在何种情况下修剪树木,如确保树木按照所需要的形状或大小生长、促进树木的健康,并且详细介绍了原因和方法。据此可知,作者的目的是在修剪树木方面给予实践指导,A项正确。
转载请注明原文地址:https://kaotiyun.com/show/oHTO777K
0
考博英语
相关试题推荐
AWhileexpertsinbasicscienceareimportant,BskilledtalentsshouldbetheCoverridingmajoritysincetheyareDatheavydema
ItisincongruousthatthenumberofBritishinstitutionsofferingMBAcoursesshouldhavegrownby254percentduringaperiod
ItisincongruousthatthenumberofBritishinstitutionsofferingMBAcoursesshouldhavegrownby254percentduringaperiod
ItisincongruousthatthenumberofBritishinstitutionsofferingMBAcoursesshouldhavegrownby254percentduringaperiod
ItisincongruousthatthenumberofBritishinstitutionsofferingMBAcoursesshouldhavegrownby254percentduringaperiod
Theevolutionofsexratioshasproduced,inmostplantsandanimalswithseparatesexes,approximatelyequalnumbersofmalesa
Thepreservedfoodshouldretainpalatableappearance,flavor,andtexture,aswellasitsoriginalnutritionalvalue.
ThemajorreasonwhyAmericansenjoyanabundantfoodsupplyisthatthearablelandattheirdisposalforfoodproductionis___
PerhapsIshouldnothavedoneso,butIchangedmymindaboutthenewjobeventhoughIwas______lastweek.
随机试题
卵巢和子宫的固定装置是什么?
A.3’→5’B.5’→3’C.N端→C端D.C端→N端DNA的合成方向是
患者,男,40岁。体检头颅CT发现左顶4.0cm×3.0cm囊性肿块,患者否认有外伤史,否认高血压、糖尿病病史,其他实验室检查未见明显异常,体格检查未见阳性体征。关于影像学分析下列哪些是正确的
老年男性,65岁,既往有胆囊结石病史,因上腹痛4小时由家属送诊,查体:意识淡漠,血压90/50mmHg,右上腹部肌紧张可能采取的手术方式为
A.作用于细胞核内受体B.作用于线粒体C.作用于内质网D.作用于拓扑异构酶E.作用于细胞质受体甲状腺激素
口腔颌面部感染中最易发生全身并发症的是
工程成本中的间接费用主要是企业下属施工单位为组织和管理工程施工所发生的全部支出。其中施工单位指的是建筑安装企业的()
某公司1月1日投资建设一条生产线,建设期3年,经营期8年,建成后每年净现金流量均为500万元,该生产线净现金流量的年金形式是()。
下列选项中,符合所给图形的变化规律的是()。
【S1】【S5】
最新回复
(
0
)