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
Plants in Desert Only special plants can survive the terrible climate of a desert, for these are regions where the annual ran
Plants in Desert Only special plants can survive the terrible climate of a desert, for these are regions where the annual ran
admin
2009-06-15
47
问题
Plants in Desert
Only special plants can survive the terrible climate of a desert, for these are regions where the annual range of the soil temperature can be over 75℃. Furthermore, during the summer there are few clouds in the sky to protect plants from the sun’s ray. Another problem is the fact that there are frequently strong winds which drive small, sharp particles of sand into the plants, tearing and damaging them. The most difficult problem for all forms of plant life, however, is the fact that the entire annual rainfall occurs during a few days or weeks in spring.
Grasses and flowers in desert survive from one year to the next by existing through the long, hot, dry season in the form of seeds. These seeds remain inactive unless the right amount of rain falls. If no rain falls, or if insufficient rain falls, they wait until the next year, or even still the next. Another factor that helps these plants to survive is the fact that their life cycles are short. By the time that the water from the spring rains disappears—just a few weeks after it falls—such plants no longer need any.
The perennials have special features which enable them to survive as plants for several years. Thus, nearly all desert perennials have extensive root systems below ground and a small shoot system above ground. The large root network enables the plant to absorb as much water as possible in a short time. The small shoot system, on the other hand, considerably limits water loss by evaporation.
Another feature of many desert perennials is that after the rainy season they lose their leaves in preparation for the long, dry season, just as trees in wetter climates lose theirs in preparation for the winter. This reduces their water loss by evaporation during the dry season. Then, in next rainy season, they come fully alive once more, and grow new branches, leaves and flowers, just as the grasses and flowers in desert do.
选项
A、Right
B、Wrong
C、Net mentioned
答案
B
解析
转载请注明原文地址:https://kaotiyun.com/show/9WLd777K
本试题收录于:
职称英语理工类A级题库职称英语分类
0
职称英语理工类A级
职称英语
相关试题推荐
AnObservationandanExplanationItisworthlookingatoneortwoaspectsofthewayamotherbehavestowardsherbaby.
The"YouthEmancipation"programmeaimsathelpingyoungpeople______.Itcanbeinferredfromparagraph5thatfamilytiesare
StepBackinTimeDoyouknowthatwelivealotlongernowthanthepeoplewhowerebornbeforeus?Onehundredyearsagot
Sheshowslittleregardforthefeelingsofothersanddoesexactlywhatshewantsto.
Argumentamongthespeakersattheconferenceisborderingonviolence.
Theimmensechangeofthecityastonishedeverymemberoftheconference.
ATripEveryyearNewZealanderslivinginLondoncanbeseenloadingupKombivansandheadingofftoexperiencethe“cla
By1900,manymunicipalitieshadbeguntorestricttheuseofautomobilesinordertoen-surepedestriansafety.
EnglishandEnglishCommunityThereisnodenyingthatEnglishisausefullanguage.ThepeoplewhospeakEnglishtodaymake
SharksPerformaServiceforEarth’sWatersItishardtogetpeopletothinkofsharksasanythingbutadeadlyenemy.They
随机试题
简述国体和政体的区别和联系。
妊娠早期,仍于月经期有少量阴道出血,无损于胎儿,中医诊断为:
《中华人民共和国水污染防治法》规定,国家()新建不符合国家产业政策的小型造纸、制革、印染、染料、炼焦、炼硫、炼砷、炼汞、炼油、电镀、农药、石棉、水泥、玻璃、钢铁、火电以及其他严重污染水环境的生产项目。
某公司总承包某厂煤粉制备车间新增煤粉生产线的机电设备安装工程,新生产线与原生产线相距不到10m,要求扩建工程施工期间原生产线照常运行,工程内容包括一套球磨机及其配套的输送、喂料等辅机设备安装;电气及自动化仪表安装;一座煤粉仓及车间的非标管道制作及安装;煤粉
从事代理记账业务的机构应持有代理记账许可证书(会计师事务所除外),该代理记账许可证书的核发机关是()。
下列个人取得收入,应按照特许权使用费项目征收个人所得税的是()。
乙股份有限公司(以下简称乙公司),属于增值税一般纳税人,适用的增值税税率为17%。乙公司20×2年至20×5年与固定资产有关的经济业务资料如下:(1)20×2年12月1日,乙公司购入一条需要安装的生产线,取得的增值税专用发票上注明价款为1000万
甲股份有限公司(以下简称“甲公司”)为增值税一般纳税人,其销售产品及提供运输劳务均属于主营业务,已知适用的销售货物增值税税率为17%,交通运输业劳务增值税税率为11%,提供增值税应税服务的增值税税率为6%。商品在销售实现时同时结转成本,无特殊说明所售商品及
颜回说:“夫子循循然善诱人,博我以文,约我以礼、欲罢不能。”这说明德育工作要遵循()。
使用关系运算对表进行操作,得到的结果是
最新回复
(
0
)