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
When marine organisms called phytoplankton photosynthesize, they absorb carbon dioxide dissolved in seawater, potentially causin
When marine organisms called phytoplankton photosynthesize, they absorb carbon dioxide dissolved in seawater, potentially causin
admin
2014-09-13
74
问题
When marine organisms called phytoplankton photosynthesize, they absorb carbon dioxide dissolved in seawater, potentially causing a reduction in the concentration of atmospheric carbon dioxide, a gas that contributes to global warming. However, phy-
line toplankton flourish only in surface waters where iron levels are sufficiently high. Mar-
5 tin therefore hypothesized that adding iron to iron-poor regions of the ocean could help alleviate global warming. While experiments subsequently confirmed that such a procedure increases phytoplankton growth, field tests have shown that such growth does not significantly lower atmospheric carbon dioxide. When phytoplankton utilize carbon dioxide for photosynthesis, the carbon becomes a building block for organic
10 matter, but the carbon leaks back into the atmosphere when predators consume the phytoplankton and respire carbon dioxide.
It can be inferred that the author of the passage mentions predators(line 10)primarily in order to
选项
A、help explain why Martin’s hypothesis is incorrect
B、identify one effect of adding iron to iron-poor waters
C、indicate how some carbon dioxide is converted to solid organic matter
D、help account for differences in the density of phytoplankton between different regions of the ocean
E、point out a factor that was not anticipated by the scientists who conducted the field tests mentioned in the passage
答案
A
解析
Lines 7-11 of the paragraph present the evidence against Martin’s hypothesis. Lines 7-8 present field test results showing that Martin’s hypothesis is incorrect, and the last sentence explains these results: the reason the increased phytoplankton resulting from the addition of iron do not reduce atmospheric carbon dioxide is that while the phytoplankton absorb carbon dioxide, the gas reenters the atmosphere when it is respired by phytoplankton predators. Therefore Choice A is correct: predators are mentioned to explain why Martin’s hypothesis is incorrect. Choice B is not correct because while predators’ consumption of phytoplankton and respiration of carbon dioxide might be considered one indirect consequence of adding iron to iron-poor waters, identifying a consequence is not the primary function of the mention of predators. Choice C is incorrect because the reference to predators is used to explain how carbon dioxide reappears as a gas, and Choice D is incorrect because no connection is suggested between predators and the distribution of phytoplankton. Choice E is not correct because it is Martin who did not anticipate this factor, rather than the scientists who conducted the field tests.
转载请注明原文地址:https://kaotiyun.com/show/rfjO777K
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
Alawyerfriendofminehasdevotedherselftotheserviceofhumanity.Herspecialareaiscalled"publicinterestlaw".Man
Nooneknowshowmanlearnedtomakewords.Perhapshebeganbymakingsoundslikethosemadebyanimals.Perhapshegruntedlik
LincolnthoughtitwaswrongtokeepNegroes_________slaves.
WhatarethedifferencesbetweenpublicandprivateinAmericanhighereducation?Abigdifferenceinvolvesmoney.Publiccolleg
Itwasacoldwinterday.AwomandroveuptotheRainbowBridgetollbooth(收费站)."I’mpayingformyself,andforthesixcarsb
Mr.Holmescalledatmanyschools_________helivedtoaskthemtoaccepthisson,buthewasrefusedeverywhereforbeingablac
Thefollowingdatasufficiencyproblemsconsistofaquestionandtwostatements,labeled(1)and(2),inwhichcertaindataare
Inthefigureabove,pointsA,B,C,andDarecollinearandaresemicircleswithdiametersd1cm,d2cm,andd3cm,respective
AnadvertisementdesignedtoconvincereadersofthegreatdurabilityofautomobilesmanufacturedbytheDeluxeMotorCarCompan
随机试题
D细节辨认题。对话中当男士问女士为什么要从事教育行业时,女士说她40年前曾是公立小学的一位教师,虽然已经很多年没有教过学了,但她想要使落后社区的生活有所改善的决心从未动摇过。也就是说,她从事教育工作是为了让那些弱势群体过上更好的生活。因此答案为D。
钻芯法检测混凝土强度,需对芯样测量()。
稀浆封层当需要加快破乳时,可采用一定数量的()作填料。
因纳税人、扣缴义务人计算错误等失误,未缴或少缴的税款,税务机关在3年内可以追征税款、滞纳金。有特殊情况的,追征期可以延长到()年。
进口设备的FOB价格加上途中保险费等于进口设备的CIP价格。( )
行政监察监督具有政府行政监督的性质。( )
维护社会治安秩序和社会稳定的工作主要内容包括()。
中国古代最长的一首叙事诗是()。
某测验的信度是0.8,现欲通过增加测验项目的长度的方法将信度提高到0.9,原测验的有20个题目,新测验需增加的题目数是
A、Followthewayofstoppingalcoholdrinking.B、Changepeople’sattitudestowardssmoking.C、Stopproducinganykindofcigaret
最新回复
(
0
)