首页
财务会计
医药卫生
金融经济
考公考编
外语考试
学历提升
职称考试
建筑工程
IT考试
其他
登录
财务会计
Trees should only be pruned when there i
Trees should only be pruned when there i
免费考试题库
2019-12-17
33
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 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 hurts and then paint it with one of the substances available from garden shops produced especially forthis 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.Why is a special substance painted on the tree?
选项
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.
答案
B
解析
由第三段“One result of pruning is that an open wound is left on the tree and this provides an easy entry for disease”和“You should allow the cut surface to dry for a few hums and then paint it with one of the substances available from garden shops produced especially for this Justification”可知。修剪树木留下的伤口给了疾病侵袭的机会,因此涂刷特殊物质是为了阻挡疾病通过伤口进入树木。故选B。
转载请注明原文地址:https://ti.zuoweng.com/ti/2AlsKKKQ
相关试题推荐
Whatshouldyouthinkaboutintryingto
Treesshouldonlybeprunedwhentherei
Treesshouldonlybeprunedwhentherei
Treesshouldonlybeprunedwhentherei
Treesshouldonlybeprunedwhentherei
Treesshouldonlybeprunedwhentherei
Whatshouldyouthinkaboutintryingto
Whatshouldyouthinkaboutintryingto
Whatshouldyouthinkaboutintryingto
Youshouldexploreyourtalentssoasto
随机试题
肾上腺超声检查常用的频率是 A.3.5MHz或5~8MHz B.1~2MHz
下列疾病与传播媒介组合错误的是 A.流行性乙型脑炎--蚊 B.森林脑炎--蜱
下列不能体现个人征信系统的经济功能的是()。
可撤销的合同类型有()。
一名社会工作者因为自己的工作压力大而感到纠结不安,想另谋出路,便去求教于他的督导
患者男,49岁。1个月前因肛痈行切开引流术,疮口不愈。查体:肛门右侧皮肤可见开口
建筑工程的()应当进守建筑节能标准。 A.建设、设计、施工和监理单位B.建
纠正缺O2和CO2潴留最重要的措施是A:氧气疗法B:保持气道的通畅C:增加通气量D:纠正酸碱平衡失调E:提高呼吸系统兴奋性
依托泊苷的给药方式不包括A:静脉推注B:静脉滴注C:胸腔注射D:腹腔注射E:鞘内注射
关于诉的分类,下列说法不正确的是A.张三和李四申请法院确认其在人民调解委员会主持下达成的调解协议的效力,系确认之诉B.甲公司起诉要求乙公司履行合同,乙公司主张