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
Why should pruning be done?
Why should pruning be done?
admin
2014-03-21
31
问题
Why should pruning be done?
Trees should only be pruned when there is a good and clear reason for doing so and 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 heavier. You may cut out diseased or dead wood, or branches that are rubbing against each other and thus cause wounds. Removing branches that are blocking up the center and so preventing the free movement of air may encourage the health of a tree.
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 done in winter, for then you can see the shape of the tree clearly 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.
选项
A、To give practical instruction for pruning a tree.
B、To give a gardener description of pruning.
C、To explain how trees develop disease.
D、To discuss different methods of pruning.
答案
B
解析
本文是篇科普文章,主要就是向园艺工人介绍剪枝的作用以及如何正确地剪枝和进行剪枝后的护理工作,因此答案是B。
转载请注明原文地址:https://kaotiyun.com/show/DNUK777K
0
专业英语四级
相关试题推荐
Whichofthefollowingstockindexesgotthehighestrisingpercentage,morethan1%?
Industryshouldgetridofhalfitsbosses,saysbehavioralpsychologistAlfredJ.Marrow."Adultsarequitecapableofhandling
In"Hemadeitclearthathedidn’twanttotalktome."theitalicizedpartis
Youwillseetoitthateverythingisreadybeforetheguestsarrive.Theunderlinedpartmeans______.
Duringrecentyearswehaveheardmuchabout"race":howthisracedoescertainthingsandthatracebelievescertainthingsand
Ayoungconsultant’slifeistiring.A(1)_____weekstartsbeforedawnonMonday,witharushtotheairportandaflightto(2)_
Moreandmoreemployersaredemandingthatworkerswhosmokeorareoverweightshoulderagreatershareoftheirhealthcarecos
The_______crownjewelsarekeptintheTowerofLondon.
ChristinaHudsonisgoingto______inLondon.
Itisurgentthatimmediatemeasures______tostopthesituation.
随机试题
孙中山认为,民生主义必须从根本上解决的两大问题是
声频低于16Hz称之为()。
脑干梗死常引起
采用重量法测定空气中可吸入颗粒物的浓度。采样时现场气温为18℃,大气压力为98.2kPa,采样流速为13L/min,连续采样24h,若采样前滤膜重量为0.3526g,采样后滤膜重量为0.5961g,则空气中可吸入颗粒物浓度为()mg/m3。
某国家投资的大型乙烯工程项目的设备采购合同,单项合同估算价在( )以上的,必须招标。
根据会计法律制度的规定,除会计师事务所之外,从事代理记账业务的机构必须取得代理记账许可证。该代理记账许可证的审批机关是( )。
某生产企业,职工共30人,企业的资产总额为300万元,上年亏损52万元,2016年企业有关生产、经营资料如下:(1)取得产品销售收入230万元、国债利息收入23万元,金融债券利息收入39万元;(2)发生产品销售成本100万元;发生产品销售税金及附加5.
会议调查法的缺点包括()。
基因是遗传的物质基础.它可以通过复制把遗传信息传递给下一代,但不能使遗传信息得到表达。()
数据库运行环境和参数的调整是数据库优化的重要工作。下列关于此项工作的说法,错误的是()。
最新回复
(
0
)