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
There have long been dead zones–water too low in oxygen to sustain most forms of life—in the Gulf of Mexico, which receives the
There have long been dead zones–water too low in oxygen to sustain most forms of life—in the Gulf of Mexico, which receives the
admin
2018-07-04
22
问题
There have long been dead zones–water too low in oxygen to sustain most forms of life—in the Gulf of Mexico, which receives the waters of the Mississippi River. Scientists studied sediment cores from areas where the gulf’s most recent dead zone occurred. The scientists dated the sediment and counted species of foraminifera (marine protozoans) in the sediment; these species thrive in low-oxygen waters. As far back as 1823, the foraminifera thrived especially during Mississippi River flood years (during which nutrients levels increase), suggesting that nutrients in floodwaters can trigger low-oxygen water. The foraminifera in the core samples were most abundant after 1950, when farmers began using some fertilizer, which is rich in nutrients. Researchers believe that increased use of fertilizer leads to more-extreme dead zones.
It can be inferred from the passage that the “researchers” would agree with which of the following statements about the use of fertilizer?
选项
A、If farmers near the Mississippi River decreased the amount of fertilizer that they used, the severity of the dead zones could be diminished.
B、If farmers near the Mississippi River continue their dependence upon fertilizers, foraminifera population will eventually decline.
C、If farmers near the Mississippi River stopped using fertilizers altogether, there would no longer be dead zones.
答案
A
解析
文章最后研究者们得到的结论就是肥料的增加会促进死亡区域的产生。因此,肥料的减少也必然会减少死亡区域的产生。A正确。
本文只能看出,继续使用肥料,死亡区域会一直存在,因而foraminifera会一直生长。至于以后foraminifera会不会减少,文中看不出。B不选。
转载请注明原文地址:https://kaotiyun.com/show/dKjO777K
本试题收录于:
GRE VERBAL题库GRE分类
0
GRE VERBAL
GRE
相关试题推荐
Thetableaboveshowstheone-waydrivingdistance,inmiles,betweenfourcities:P,Q,R,andS.Forexample,thedistancebet
IfZisrepresentedbythedecimal0.W7,whatisthedigitW?
Whentheevenintegernisdividedby7,theremainderis5,thenwhatistheremainderwhennisdividedby14?
Inthefigureabove,theshadedregionrepresentsthefrontofanuprightwoodenframearoundtheentrancetoanamusementpark
Whichofthefollowingmostaccuratelystatesthepurposeofthepassage?Itcanbeinferredfromthepassagethattheauthorc
Theprimarypurposeofthepassageisto______Whichofthefollowingwouldtheauthorofthepassagebemostlikelytoapprove
TheancientGreekplaywrightEuripidesfollowedtheestablishedconventionsofversecompositionlessrigorouslyattheendofh
Sometimeduringthe1950’s,rockmusicpermanentlyoustedjazzfromthemusicscene.Thisisevidentfromthebehaviorofyouths
Thispassageisexcerptedfrommaterialpublishedin1997.Scientistshavebeenpuzzledbytheseemingdisparitybetweenmodels
Whiletheofficial’sactionswerewidelydenounced,theywerenonetheless______,fullywithintheboundariesofrecognizedlaws.
随机试题
舞蹈病的发病原因主要是
患者呛咳阵作,喉中痰鸣气粗,胸高胁胀,痰黄质稠,烦闷不安,汗出面赤,口苦,舌红苔黄腻,脉弦滑。宜选用
某女,月经周期为33~35天,经来淋漓至14日始净。诊断为
根据韦氏智力测验结果,个体智商在()以上称极优秀,智商小于()为智力缺损
在行政诉讼过程中,出现下列情形之一的应中止诉讼______。
听雨写下这个题目,便不自觉地在心里吟诵起那些熟悉的诗篇,而且大多是古人的句子。雨,大概是古典的。而且常常当人们进入一种诗化的境况,才会从喧嚣的市井声浪里逃出来,逃出来的耳朵才能听雨。听雨有三个条件:第一是心静而神动,心静者不为市井或朝野的得失荣辱
关于巨额财产来源不明罪,下列说法不正确的是()
[*]
A、P1P3AB、P2P3AC、AP3P2D、AP1P3B矩阵A作两次初等行变换可得到矩阵B,而AP3P2,AP1P3描述的是矩阵A作列变换,故应排除。该变换或者把矩阵A第一行的2倍加至第三行后,再第一、二两行互换可得到B;或者把矩阵A的第一、
Writea250-wordcompositionaboutyourpointofviewonOnlineSharingCulture.Yourcompositionistoinclude3paragraphs;1.
最新回复
(
0
)