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
34
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.
Grasses and flowers in the desert whose life cycles are short show their ability to adapt to the quick disappearance of rainwater there after it falls in spring.
选项
A、Right
B、Wrong
C、Not mentioned
答案
A
解析
题干的大意是:沙漠里春季的雨水很快会消失,而沙漠里生命周期短的花草能够适应这一环境特点。利用题干中的“life cycles”作为线索词,可以很快把第二段第四、五句确定为答案相关句,这两句话表明,生命周期短能帮助植物在沙漠中存活,因为春季的雨水消失后,这些植物将不再需要雨水。可见题干的说法与原文的说法一致。
转载请注明原文地址:https://kaotiyun.com/show/KEGd777K
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
Poorchildrenshouldnotbedeprivedoftheopportunitytoparticipateinsportswheneverpossible.
ADon’tBeaPerfectionistBTheBenefitsofKnowingWhereWeWanttoGoCHardWorkPlusGoodLuckDTheOutcomesofOurEf
Psychologistshavedoneextensivestudiesofhowwellpatientscomplywithdoctors’orders.
Atfirstglance,aforestappearstobeahaphazardcollectionoftrees,shrubs,vines,andflowers.
NewcomersWhenacountryisunder-populated,newcomersarenotcompetitors,hutassistants.Ifmorecometheymayproducen
CarefulobservationsandsystematicstudiesofsunspotsInthelastparagraphtheword"persistent"means
TheBuildingofthePyramidsTheoldeststonebuildingsintheworldarethepyramids.Theyhavestoodfornearly5,000yea
AccurateTimerThesedaystimeiseverything.Betweenmeetingsandappointments,deadlinesandconferencecalls,myschedule
WhichofthefollowingstatementsaboutFlowersandYeoistrue?WhichofthefollowingisNOTmentionedasacauseoftheprob
A.itsbenefitsB.theirchildhoodmemoriesC.theirstressD.moretrainingE.disciplineproblemsF.becauseofitslowpayThegov
随机试题
程序状态字包含的内容有()
A.肠息肉B.直肠癌C.肠套叠D.粘连性肠梗阻2岁幼儿血性大便
下列选项中,关于冬期城镇道路路基施工的质量控制要求,说法正确的有()。
资金募集阶段,买者自负的前提是()。
2019年1月,某电视剧制作中心编剧张先生从该中心取得工资3000元、2018年第四季度的奖金1500元及剧本使用费10000元。张先生1月应预扣预缴个人所得税()元。
一个水池安装了甲、乙两条进水管,在同样的时间内,乙管的进水量是甲管的1.6倍。为了灌满空着的水池,开始由甲管灌入池水,然后关闭甲管,打开乙管,由乙管单独灌满剩下的,共用12分钟15秒,则甲管开了多长时间?
(623×377-120)÷(375×625+376)的值为()。
某市经济委员会准备选四家企业给予表彰,并给予一些优惠政策。从企业的经济效益来看,A、B两个企业比C、D两个企业好?据此,再加上以下哪项可推出“E企业比D企业的经济效益好”的结论?
一台多媒体PC机具有图像输入功能,为输入照片图像所采用的外部设备是( )。
Migrationisusuallydefinedas"permanentofsempermanentchangeofresidence."Thisbroaddefinition,ofcourse,wouldinclude
最新回复
(
0
)