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
The plant called the scarlet gilia can have either red or white flowers. It had long been thought that hummingbirds, which forag
The plant called the scarlet gilia can have either red or white flowers. It had long been thought that hummingbirds, which forag
admin
2015-05-25
31
问题
The plant called the scarlet gilia can have either red or white flowers. It had long been thought that hummingbirds, which forage by day, pollinate its red flowers and that hawkmoths, which forage at night, pollinate its white flowers. To try to show that this pattern of pollination by colors exists, scientists recently covered some scarlet gilia flowers only at night and others only by day: plants with red flowers covered at night became pollinated; plants with white flowers covered by day became pollinated.
Which of the following, if true, would be additional evidence to suggest that hummingbirds are attracted to the red flowers and hawkmoths to the white flowers of the scarlet gilia?
选项
A、Uncovered scarlet gilia flowers, whether red or white, became pollinated at approximately equal rates.
B、Some red flowers of the scarlet gilia that remained uncovered at all times never became pollinated.
C、White flowers of the scarlet gilia that were covered at night became pollinated with greater frequency than white flowers of the scarlet gilia that were left uncovered.
D、Scarlet gilia plants with red flowers covered by day and scarlet gilia plants with white flowers covered at night remained unpollinated.
E、In late August, when most of the hummingbirds had migrated but hawkmoths were still plentiful, red scarlet gilia plants produced fruit more frequently than they had earlier in the season.
答案
D
解析
The results reported in the last sentence of the passage suggest that hummingbirds do pollinate red-flowered plants and that hawkmoths do pollinate white-flowered plants. But to prove that they are attracted preferentially to those colors requires knowing whether they also pollinate flowers of the other color that are uncovered during their respective foraging hours—white flowers uncovered during hummingbirds’ daytime hours, and red flowers uncovered during hawkmoths’ nocturnal hours. Choice D states that such plants remain unpollinated, so it is the correct answer. Of the other options, both Choices C and E could suggest the opposite of what is required, so they are incorrect. Choice A is incorrect because the comparative frequency at which uncovered gilia flowers are pollinated has no bearing on the argument. Likewise, the presence of some quantity of unpollinated flowers of either color does not affect the argument, so Choice B is also incorrect.
转载请注明原文地址:https://kaotiyun.com/show/IujO777K
本试题收录于:
GRE VERBAL题库GRE分类
0
GRE VERBAL
GRE
相关试题推荐
Concerningmoneyoranythingelse,conflictsbetweenhusbandandwifeusuallyreflectapowerstruggle.Conflictsbetweenparent
Economicdevelopmentdependsontheextractionofnaturalresourcesandonlow-skilledlabor,whichhasresultedinaweakmanuf
Alawyerfriendofminehasdevotedherselftotheserviceofhumanity.Herspecialareaiscalled"publicinterestlaw".Man
Alawyerfriendofminehasdevotedherselftotheserviceofhumanity.Herspecialareaiscalled"publicinterestlaw".Man
I’dratheryou____________makeanycommentontheissueforthetimebeing.
Thesecrettoeatinglessandbeinghappyaboutitmayhavebeencrackedyearsagoby—Mcdonald’s.Accordingtoanewstudyfrom
It’snouseringingmeupattheofficethisweekbecauseI’m_________.
________blackcloudscoveringthesky,hestoppedhisworkandwenthome.
Untilrecently,scientistsdidnotknowofacloseverte-brateanaloguetotheextremeformofaltruismabservedineusocialin
Inhouseholdelectricovens,theheatingelementhasonlytwosettings—onandoff.Athermostatconnectedtotheoven’stempera
随机试题
A.G蛋白耦联受体B.化学门控通道C.电压门控通道D.机械门控通道E.酪氨酸激酶受体神经轴突膜上与动作电位的产生直接有关的蛋白质属于
肾淤血一般主要原因是
女,40岁。患风心病10年,近来心悸、胸闷痛、气短、下肢浮肿、尿少。数分钟前突然晕倒,意识丧失,皮肤苍白,唇绀,大动脉搏动扪不到,呼吸停止,其原因是
某市公安局刑事警察赵某下班期间发现有人斗殴,即予以制止。正巧打架的马某与赵某有隙,便对赵某出言不逊。赵某大怒,拔枪将马某击伤。下列关于赔偿责任的说法正确的是哪项?
下列选项中,()的理论基础是新古典经济学有关资源优化配置的理论。
社会保障费属于( )。
过程能力的含义是()。
“立德树人,把社会主义核心价值体系融人国民教育全过程”这句话在《国家中长期教育改革和发展规划纲要(2010—2020年)》中所体现的战略主题是()。
设f(x)=3x3+x2|x|,则使f(n)(0)存在的最高阶数n为
DothefollowingstatementsagreewiththeinformationgiveninReadingPassage2?Inboxes20—26onyouranswersheetwrite
最新回复
(
0
)