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
Since the Hawaiian Islands have never been connected to other landmasses, the great variety of plants in Hawaii must be a result
Since the Hawaiian Islands have never been connected to other landmasses, the great variety of plants in Hawaii must be a result
admin
2013-01-28
63
问题
Since the Hawaiian Islands have never been connected to other landmasses, the great variety of plants in Hawaii must be a result of the long-distance dispersal of seeds, a process that requires both a method of transport and an equivalence between the ecology of the source area and that of the recipient area.
There is some dispute about the method of transport involved. Some biologists argue that ocean and air currents are responsible for the transport of plant seeds to Hawaii. Yet the results of flotation experiments and the low temperatures of air currents cast doubt on these hypotheses. More probable is bird transport, either externally, by accidental attachment of the seeds to feathers, or internally, by the swallowing of fruit and subsequent excretion of the seeds. While it is likely that fewer varieties of plant seeds have reached Hawaii externally than internally, more varieties are known to be adapted to external than to internal transport.
It can be inferred from information in the passage that the existence in alpine regions of Hawaii of a plant species that also grows in the southwestern United States would justify which of the following conclusions?
选项
A、The ecology of the southwestern United States is similar in important respects to the ecology of alpine regions of Hawaii.
B、There are ocean currents that flow from the southwestern United States to Hawaii.
C、The plant species discovered in Hawaii must have traveled from the southwestern United States only very recently.
D、The plant species discovered in Hawaii reached there by attaching to the feathers of birds migrating from the southwestern United States.
答案
A
解析
在一些重要的方面,美国西南部的生态与夏威夷高山地区的生态大致相同。根据第一段,来源区(source area)和受援区(recipient area)的生态大致相同,两个地区就能长出同一种植物。在夏威夷的高山地区生长的植物也能在美国的西南部生长,这说明来源区和受援区的生态大致相同。
转载请注明原文地址:https://kaotiyun.com/show/1u1O777K
0
考博英语
相关试题推荐
Thegreatestresultsinlifeareusuallyattainedbysimplemeans,andtheexerciseofordinaryqualities.1.Thecommonlifeo
Fastfood,amainstayofAmericaneatingfordecades,mayhavereachedaplateauintheUnitedStatesasthematuringbaby-boom
Areyoualwayssureyouknowwhatpeoplemeanwhentheytrytodescribetheirfeelingstoyou?Weusebothwordsandgesturesto
Concernwithmoney,andthenmoremoney,inordertobuytheconveniencesandluxuriesofmodernlife,hasbroughtgreatchanges
Influenzashouldnotbedismissedasatrivialdisease.Itkillsthousandsofpeopleeveryyearataveryhighcosttotheecono
AsDrSamuelJohnsonsaidinadifferenteraaboutladiespreaching,thesurprisingthingaboutcomputersisnotthattheythink
Nanotechnology,accordingtoitsfans,willjump-startanewindustrialrevolutionwithmolecular-sizedstructuresascomplexas
Inmostpeople’smind,growthisassociatedwithprosperity.WejudgehowwelltheeconomyisdoingbythesizeoftheGrossNat
BillWinner,asalesmanagerwith10yearsinthemedicalindustry,wantstoshifthiscareerintotheinformationtechnology(I
Amidremarkableprogressoninflationandfiscalreform,Italyheadsinto1998withbrightprospectsforeconomicgrowthandits
随机试题
人民法院在接到起诉状时对符合法律规定起诉条件的,应当登记立案。对当场不能判定是否符合法律规定的起诉条件的,应当()。
男,18岁,左上臂近端疼痛、肿胀1个月,就诊拍X线片显示:左肱骨上段膨胀性囊状透亮区,边界清,内有骨性间隔将囊腔分成蜂窝状。最可能的诊断是
在下列肌中,既能上提肩胛骨,又能下降肩胛骨的是
下列选项属于职业健康安全管理制度的是()。
证券公司对客户融资融券的额度按现行规定不得超过客户提交保证金的( )倍。
初中阶段课程标准中“数与代数”包括数与式、方程与不等式和()。
阅读下面的文章,回答后面的问题。江湖苏轼在历史长长的小巷里,有一个人总会让我们为之倾倒。他总是站在千年外的月光下,峨冠博带,长须飘飘,脸上挂着一副顽皮的笑
《革命军》是清末资产阶级革命派的一篇战斗檄文,其作者是()。
伊斯兰教的经典是()。
Paperisdifferentfromotherwasteproducebecauseitcomesfromasustainableresource:trees.Unlikethemineralsandoiluse
最新回复
(
0
)