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
54
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
HintsandTipstoSaveMoneyA)Spendless.Thisisnotoversimplifying
[originaltext]Wasteproductsfromapopularalcoholicdrinkcouldbeusedi
将MnO2和浓盐酸共热时,有73g氯化氢被氧化,生成氯气的体积(标准状况下)是
平装书刊的装帧加工流程不包括()。A.包本 B.烫背 C.书壳加工 D.
A.维生素B B.维生素B C.维生素PP D.叶酸 E.泛酸参与转氨基
以下属于气质的特点的有()A.可塑性 B.独特性 C.稳定性 D.依
不良资产业务是指资产公司根据市场原则购买转让方的不良资产,并通过()等方式,对收
A.镇肝熄风汤 B.龙胆泻肝汤 C.八正散 D.蒿芩清胆汤 E.甘露消毒
国务院银行业监督管理机构对于银行业金融机构违反规定从事未经批准或者未备案的业务活
A.血压<130/85mmHg B.血压<140/90mmHg C.血压<1
最新回复
(
0
)