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
36
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.
The passage supplies information for answering which of the following questions?
选项
A、Why does successful long-distance dispersal of plant seeds require equivalence between the ecology of the source area and that of the recipient area?
B、Why are more varieties of plant seeds adapted to external rather than to internal bird transport?
C、What varieties of plant seeds are birds that fly long distances most likely to swallow?
D、What is a reason for accepting the long-distance dispersal of plant seeds as an explanation for the origin of Hawaii flora?
答案
D
解析
全文都在问答为什么能够远距离地将植物的种子输送到夏威夷这问题。
转载请注明原文地址:https://kaotiyun.com/show/2u1O777K
0
考博英语
相关试题推荐
Eachyear,millionsofpeopleinBangladeshdrinkgroundwaterthathasbeenpollutedbynaturallyhighlevelsofarsenicpoison
Thegreatestresultsinlifeareusuallyattainedbysimplemeans,andtheexerciseofordinaryqualities.1.Thecommonlifeo
Areyoualwayssureyouknowwhatpeoplemeanwhentheytrytodescribetheirfeelingstoyou?Weusebothwordsandgesturesto
Intelligentreadersknowatoncehow______weare,andhowskeptical,howfirmforothersandhowdiffidentaboutourselves.
Researcherswhorefusetosharedatawithothersmay【51】otherstowithholdresultsfromthem,【52】astudybyhealth-policyanalys
Researcherswhorefusetosharedatawithothersmay【51】otherstowithholdresultsfromthem,【52】astudybyhealth-policyanalys
In1993,amallsecuritycameracapturedashakyimageoftwo10-year-oldboysleadingmuchsmallerboyoutofaLiverpool,Engl
Neverhasastraitjacketseemedsoill-fittingorsoinsecure.TheEuroarea’s"stabilityandgrowthpact"wassupposedtostop
Amidremarkableprogressoninflationandfiscalreform,Italyheadsinto1998withbrightprospectsforeconomicgrowthandits
随机试题
卫生法中刑事责任的犯罪构成是
背景某建筑工程,建筑面积35000m2;地下2层,地上25层,筏板基础,钢筋混凝土剪力墙结构。室内隔墙采用加气混凝土砌块。建设单位依法选择了施工总承包单位,签订了施工总承包合同。合同约定:室内墙体等部分材料由建设单位采购;建设单位同意施工总承包单位将部分
资产的重组方式有( )。
对资源税征税范围中未列举名称的其他非金属矿原矿和其他有色金属矿原矿,由省、自治区、直辖市人民政府决定征收或暂缓征收资源税,并报( )备案。
在一定血压范围内肾血流量保持相对稳定主要靠()。
艺术:生活()
政府在开展一个关于政府工作作风的评议活动。现在需要对群众在评议活动中所反映的情况进行调研。领导把这个任务交给你。你会怎么做?
假设用12个二进制位表示数据。它能表示的最大无符号整数为(8);若采用原码,它能表示的最小负整数为(9)。
请在“考试项目”菜单上选择相应的菜单项完成以下内容:接收并阅读由ncre@163.com发来的E-mail,并回复内容为:“您所索要的E-mail地址是:mcre@sina,com”。【注意】“格式”菜单中的“编码”命令中用“简体中文
MostradioandtelevisionstationsintheUnitedStatesarecommercialstations,【C1】______istosay,theyearntheirmoneyfrom【
最新回复
(
0
)