首页
登录
职称英语
Two decades after the Emerald River Dam was built, none of the eight fish specie
Two decades after the Emerald River Dam was built, none of the eight fish specie
游客
2024-01-13
29
管理
问题
Two decades after the Emerald River Dam was built, none of the eight fish species native to the Emerald River was still reproducing adequately in the river below the dam. Since the dam reduced the annual range of water temperature in the river below the dam from 50 degrees to 6 degrees, scientists have hypothesized that sharply rising water temperatures must be involved in signaling the native species to begin the reproductive cycle. Which of the following statements, if true, would most strengthen the scientists’ hypothesis?
选项
A、The native fish species were still able to reproduce only in side streams of the river below the dam where the annual temperature range remains approximately 50 degrees.
B、Before the dam was built, the Emerald River annually overflowed its banks, creating backwaters that were critical breeding areas for the native species of fish.
C、The lowest recorded temperature of the Emerald River before the dam was built was 34 degrees, whereas the lowest recorded temperature of the river after the dam was built has been 43 degrees.
D、Nonnative species of fish, introduced into the Emerald River after the dam was built, have begun competing with the declining native fish species for food and space.
E、Five of the fish species native to the Emerald River are not native to any other river in North America.
答案
A
解析
要说明该假说是可靠的,证明Emerald河流域中温度差别较大的河水中生长的鱼没有失去它们的繁殖能力就很重要,选项(A)说明这些鱼仍能繁殖,因此是正确答案;选项(B)通过提出一个完全不。司的假说削弱了该假说;选项(C)试图支持温度变化减小了的说法,但没有证明这是正确的解释;由于(D)谈到土产鱼类开始减少后的一种发展,同关心这种减少的最初原因的该假说无关;选项(E)强调了该问题的严重性,但没有说明是什么原因造成的。
转载请注明原文地址:https://tihaiku.com/zcyy/3358500.html
相关试题推荐
Forthepastseveraldecades,itseemsthere’sbeenageneralconsensusonh
Forthepastseveraldecades,itseemsthere’sbeenageneralconsensusonh
Forthepastseveraldecades,itseemsthere’sbeenageneralconsensusonh
Inthetwodecadesbetween1910and1930,overtenpercenttotheBlackpopu
Inthetwodecadesbetween1910and1930,overtenpercenttotheBlackpopu
Inthetwodecadesbetween1910and1930,overtenpercenttotheBlackpopu
55.Acertainspeciesofbirdhastwobasicvarieties,crestedandnoncrested.Th
Naturalist:Fordecadeswehaveknownthatthetuatara,aNewZealandreptile,h
Caterpillarsoffallspeciesproduceanidenticalhormonecalled"juvenilehormo
Theskullsandpelvicbonesofsomespeciesofdinosaursharecharacteristicswi
随机试题
What’stheweatherlikewhereyouare?Chancesarethere’sacloudsomewhere
[originaltext]1.Michaelrequestedthathebetransferredtothecompanybranch
A.becauseB.experienceC.pushedintoD.objectionsE.protestedF.co
WhenpeoplesaythatCambridgeisauniversitytowntheydonotmeanthatit
唯物辩证法认为,事物的运动、变化、发展都离不开联系。这主要表现在()。 A.事
医学伦理学原则不包括A.尊重原则 B.公正原则 C.不伤害原则 D.生命价
关于公开发行企业债券的条件,下列说法错误的是()。A、股份有限公司的净资产额不
下列文物中,属于国家所有的是()。A.祖传文物 B.我国领海毗邻海域中遗存的
反映完成一定计量单位合格扩大结构构件需消耗的人工、材料和施工机具台班数量的定额是
A.必须先向消费者协会申诉 B.应当制作协议书 C.只能向人民法院提起民事诉
最新回复
(
0
)