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
[A] Since wind-pollinated flowers have no need to attract insects or other animals, they have dispensed with bright petals, nect
[A] Since wind-pollinated flowers have no need to attract insects or other animals, they have dispensed with bright petals, nect
admin
2022-04-28
51
问题
[A] Since wind-pollinated flowers have no need to attract insects or other animals, they have dispensed with bright petals, nectar, and scent. [B] The result is insignificant-looking flowers and catkins (dense cylindrical clusters of small, petal less flowers). [C] Wind pollination does, of course, require a lot of pollen. [D] Birch and hazel trees can produce 5.5 and 4 million grains per catkin, respectively. There are various adaptations to help as much of the pollen go as far as possible. Most deciduous wind-pollinated trees (which shed their leaves every fall) produce their pollen in the spring while the branches are bare of leaves to reduce the surrounding surfaces that "compete" with the stigmas (the part of the flower that receives the pollen) for pollen. Evergreen conifers, which do not shed their leaves, have less to gain from spring flowering, and, indeed, some flower in the autumn or winter.
Look at the four squares [■] that indicate where the following sentence could be added to the passage. These are at best a waste and at worst an impediment to the transfer of pollen in the air.
Where would the sentence best fit?
选项
答案
B
解析
转载请注明原文地址:https://www.kaotiyun.com/show/zdfO777K
0
托福(TOEFL)
相关试题推荐
Completethenotesbelow.WriteONEWORDONLYforeachanswer.ChimpanzeebehavioursSpeciesWecanfindPanorPanTroglodytes
Whatadvantagedoesthespeakermentionforeachofthefollowingphysicalactivities?ChooseSIXanswersfromtheboxandwrite
WriteNOMORETHANTWOWORDSAND/ORANUMBERforeachanswer.MonarchButterfliesHibernationButterflyspeciesadoptdifferent
Choosethecorrectletter,A,BorC.IfAmericanhadanextradayper-week,theywouldspendit
Whichlocationhasthefollowingattractions?ChooseFOURanswersfromthebox.AttractionsAfarmingmuseumBhorseridingC
ENDANGEREDSPECIESAlthoughwecannotdoanythingabouttheplantsandanimalsthatarealready【31】________,wecandosomething
Choosethecorrectletter,A,BorC.MuseumworkplacementThemostpopulartaskwhilstonworkplacementisusually
(Independencepolitical)ofnewspapers(became)a(commonfeature)of(journalism)intheUnitedStatesofthe1840’sand1850’s
A、It’snotalwaysclearwhypeoplebehaveincertainways.B、Peopleusuallyblameothersfortheirmistakes.C、Certaincondition
随机试题
____knowledgeofspacedevelopsrapidly.
男性,75岁,前列腺增生症,残余尿量350ml,BUNL5mmol/L,下列治疗方案中应首选
行列式的值为( )。
在空气中做牛顿环实验,当平凸透镜垂直向上缓慢平移而远离平面镜时,可以观察到这些环状干涉条纹()。
招标代理机构与行政机关和其他国家机关不得存在()或者其他利益关系。
建筑安装工程含税造价等于不含税造价加上______。
如QDII基金投资衍生品,衍生品的估值可以参照国际会计准则进行。()
影响国债销售价格的因素有()
儿童脑细胞的耗氧量约为全身耗氧量的()。
在计算GNP指标时,是以本国常住居民生产的最终产品和服务的价值为原则,即()。
最新回复
(
0
)