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 ra
Plants in Desert Only special plants can survive the terrible climate of a desert, for these are regions where the annual ra
admin
2014-03-13
67
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 that 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 the water from the spring rains disappears—just a few weeks after it falls—such plants no longer need any.
The perennials(多年生植物)have special features that 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 short time. The small shoot system, on the other hand, considerably limits water loss by evaporation(蒸发).
Another feature of many 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.
The shoot system of perennials can help the plants absorb less of the sun’ s ray.
选项
A、Right
B、Wrong
C、Not mentioned
答案
B
解析
利用题干中的“The shoot system”作为线索词,可以把第三段最后一句确定为答案相关句。这句话表明,茎轴系统极大地限制了蒸发所造成的水分损失,而不是说茎轴系统能减少植物对太阳光线的吸收。可见题干与原文的说法不符。
转载请注明原文地址:https://kaotiyun.com/show/dEGd777K
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
ElectricBackpackBackpacksareconvenient.Theycanholdyourbooks,yourlunch,andachangeofclothes,leavingyourhandsfr
MobilePhoneandDiseasesAstudybyscientistsinFinlandhasfoundthatmobilephoneradiationcancausechangesinhuman
Ihavenoalternativebuttoreporthimtothelocalpolice.
AMinorMicrosurgeryLastyear,SeanMartinovich,fromWhitianga,hadlife-savingsurgerywhenagolf-sizedtumorwasremove
AusingphotosBdescriptionoftheHTMLpageCcurrentpopularsearchenginesDdocumentsearchEinformationinimagesFmachi
Accordingtotheauthor,informationtechnologyhasnothingpositivetosay.Thebenefitsbroughtbyinformationtechnologyis
Shehasbeenthesubjectofmassivemediacoverage.
LEDLighting1.AnaccidentaldiscoveryannouncedrecentlyhastakenLEDlightingtoanewlevel,suggestingitcouldsoonoffer
A.usingphotosB.descriptionoftheHTMLpageC.currentpopularsearchenginesD.documentsearchE.informationi
Sandrecameacrossanimportantletteryesterdaywhilecleaningthedesk.
随机试题
犯罪预备既可以是为了自己实行犯罪而预备,也可以是为了他人犯罪而预备。
HIS涉及了多种学科,但不包括
某村有年满18周岁的村民1000人,在一次乡人大选举中作为一个选区,应选人大代表3人。第一次投票,5名代表候选人中,只有2人得票超过参加投票选民的过半数,于是进行再次选举。对此,下列哪个选项不正确?
检验检测机构要不断识别诚信要素,以满足法律、技术、管理和责任方面的基本要求。()
下列权利中,既可以在动产上设立,也可以在不动产上没立的是()。
如果被要求提供第二次意见,注册会计师应当评价不利影响的重要程度,并在必要时采取防范措施消除不利影响或将其降低至可接受的水平,下列防范措施中不可行的是()。
下列表述正确的是:
近代中国成立的第一个革命团体是由孙中山领导的()。
Questions66-70arebasedonthefollowingreadingpassage.YouaregoingtoreadalistofheadingsandatextaboutE-Commer
Ittakesagreatdealofpowerof______aspaceshipintospace.
最新回复
(
0
)