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
Keeping Cut Flowers 1 While everybody enjoys fresh cut flowers around his house, few people know how to keep them for as lo
Keeping Cut Flowers 1 While everybody enjoys fresh cut flowers around his house, few people know how to keep them for as lo
admin
2011-01-01
56
问题
Keeping Cut Flowers
1 While everybody enjoys fresh cut flowers around his house, few people know how to keep them for as long as possible. This may be done by keeping in mind a few simple facts.
2 An important thing to remember about cut flowers is that they are sensitive to temperature. For example, studies have shown that cut carnations (康乃馨) retain their freshness eight times longer when kept at 12℃ than when kept at 26℃. Keeping freshly harvested flowers at the right temperatures is probably the most important aspect of flower care.
3 Flowers are not intended by nature to live very long. Their biological purpose is simply to attract birds or insects, such as bees, for pollination (授粉). After that, they quickly dry up and die. The process by which flowers consume oxygen and produce carbon dioxide (二氧化碳), called respiration (呼吸), generates the energy the flower needs to give the flower its shape and color. The making of seeds also depends on this energy. While all living things respire, flowers have a high level of respiration. A result of all this respiration is heat, and for flowers the level of heat relative to the mass of the flower is very high. Respiration also brings about the eventual death of the flower. Thus the greater the level of respiration, the sooner the flower dies.
4 How, then, to control the rate at which flowers die? By controlling respiration. How is respiration controlled? By controlling temperature. We know that respiration produces heat, but the reverse is also true. Thus by maintaining low temperatures, respiration is reduced and the cut flower will age more slowly.
5 Another vital factor in keeping cut flowers is the quality of the water in which they are placed. Flowers find it difficult to "drink" water that is dirty or otherwise polluted. Even when water looks and smells clean, it almost certainly contains harmful substances that can endanger the flowers. To rid the water of these unwanted substances, household chlorine bleach (含氯漂白剂) can be used in small quantities. It is recommended that 15 drops of chlorine bleach (at 4% solution) be added to each liter of water. The water and solution should also be replaced each day.
A. Control of Respiration
B. Beauty of Fresh Cut Flowers
C. Role of Respiration
D. Most Important Aspect of Flower Care
E. Need for Clean Water
F. Ways of Stopping Respiration
Paragraph 5 ______.
选项
答案
E
解析
文章最后一段主要描述了水质的问题。所以,本题的选项为E:“需要干净的水是全段的中心所在。”
转载请注明原文地址:https://kaotiyun.com/show/DwFd777K
本试题收录于:
职称英语综合类B级题库职称英语分类
0
职称英语综合类B级
职称英语
相关试题推荐
Shellyhadpreparedcarefullyforherbiologyexaminationsothatshecouldbesureofpassingitonherfirstendeavor.
A.GoodresultsB.AnancientskillC.GainingattentionD.MemorytricksE.AlectureonmemorytechniquesF.Waystoimpr
Somepeopledreambutcannotremembertheirdreams.InaluciddreamwecanuseMorsecodetocommunicatewithothers.
Whatisthebenefitoftherevolutionmentionedinthefirstparagraph?Comparedtocommonelectricalconductors,superconducto
Inordertoimproveourstandardofliving,wehavetoaccelerateproduction.
A.thenationalhighwaysystemB.theeastandwestC.thefederalgovernmentD.movementandexcitementE.thenorth
Theworkersfinallycalledoffthestrikes.
FeastonTurkeyandGoodWishesatThanksgivingFourweeksagoUSchildrendressedasmonstersandaskedforsweets.ThatwasHa
BrotherlyLoveAdidasandPumahavebeentwoofthebiggestnamesinsportsshoemanufacturingforoverhalfacentury.Si
SleepWeallknowthatthenormalhumandailycycleofactivityisofsome7-8hours’sleepalternatingwithsome16-17hour
随机试题
与病理缩复环关系最密切的是
在某市的城市规划中,其土地利用现状和地形示意图如下。假定某地类规划条件如下:(1)利用现状不能为B类型;(2)利用现状为A类型,或高程在50~60m之间。则正确表现(采用灰底表示)适于该地类区域的是()。
胡甲是从事服装经营的个体工商户。2013年5月,胡甲未经批准,擅自将座落在城关镇北正街的临时营业棚改建成两层楼房。在施工时,该县城区建设管理所曾多次劝阻无效,胡甲终将楼房建成,并开始营业。6月1日,县城区建设管理所依法对胡甲的违章建房行为作出处理,责令胡甲
甲公司为乙公司的股东,投资成本为200万元,占乙公司股权比例10%。乙公司累计未分配利润和累计盈余公积为1800万元,甲公司转让该项股权公允价格为500万元。根据企业所得税法律制度的规定,甲公司应确认股权转让所得为()万元。
学生学业成就评价中用得最多的评价工具是()
行政复议必须书面审查。()
在Internet中完成从域名到IP地址或者从IP到域名转换的是_______服务。
Medicalconsumerism--likeallsortsofconsumerism,onlymoremenacingly--isdesignedtobeunsatisfying.【B1】Theprolongation
Student:Excuseme,ProfessorSmith,canyousparemeafewminutes?There’ssomethingI’dliketospeaktoyouabout.Iwon’tk
Weregularlyshipconsignments(一批托运的贷物)ofcamerastoAustraliabybothpassengerandcargolinersoftheEnterpriseShippingLi
最新回复
(
0
)