首页
登录
职称英语
In the last few decades, grassy wetlands, essential to the nesting and breeding
In the last few decades, grassy wetlands, essential to the nesting and breeding
游客
2024-01-13
32
管理
问题
In the last few decades, grassy wetlands, essential to the nesting and breeding of ducks, geese, swans, and most other species of waterfowl, have been extensively drained and cultivated in southern Canada and the northern United States, Duck populations in North American have plummeted during this time, but populations of swans and geese have been affected less dramatically. Which of the following, if true, most helps to explain the difference mentioned above?
选项
A、Prohibition of hunting of waterfowl is easier to enforce in areas under cultivation than in wild lands.
B、Most geese and swans nest and breed farther north than ducks do, in areas that still are not cultivated.
C、Land that has been harvested rarely provides food suitable for waterfowl.
D、Goose and swan populations decline in periods of drought, when breeding sites are fewer.
E、Because they are larger than ducks, geese and swans have a harder time finding protected nesting sites in areas that are cultivated.
答案
B
解析
本题为解释差异,抓住差异点来定位答案,解释为什么许多水鸟筑巢和孵化的地区被开发,鸭类数目急剧下降,但鹅类与天鹅数目未受影响。显而易见,解释差异需寻求差异双方,duck geese和swan,定位选项发现只有(A)、(E)符合。(E)与上面差异刚好相反;(B)指出由于geese与swan比duck居住在更靠北部的仍未被开发的地区,所以解释了差异,因此(B)正确。
转载请注明原文地址:https://tihaiku.com/zcyy/3358900.html
相关试题推荐
Duringthelastthreedecadesthenumberofpeopleparticipatinginphysicalfit
Inthetwodecadesbetween1910and1930,overtenpercenttotheBlackpopulati
Inthetwodecadesbetween1910and1930,overtenpercenttotheBlackpopu
Inthetwodecadesbetween1910and1930,overtenpercenttotheBlackpopu
Inthetwodecadesbetween1910and1930,overtenpercenttotheBlackpopu
Inthetwodecadesbetween1910and1930,overtenpercenttotheBlackpopu
Inthetwodecadesbetween1910and1930,overtenpercenttotheBlackpopu
Naturalist:Fordecadeswehaveknownthatthetuatara,aNewZealandreptile,h
Inthelastfewdecades,grassywetlands,essentialtothenestingandbreeding
TwodecadesaftertheEmeraldRiverDamwasbuilt,noneoftheeightfishspecie
随机试题
ManyUnitedStatescompanieshave,unfortunately,madethesearchforlegal
Withtherapiddevelopmentofeconomy,oursocietyis,ingeneral,becoming
[originaltext]Somepeoplechoosetotightlygraspthepastandstaystuckin
在字符串的KMP模式匹配算法中,需先求解模式串的next函数值,其定义如下式所示
男性,19岁,恶心、呕吐2天,嗜睡、乏力。尿酮体(±),尿糖(++++),血糖2
货币经纪公司最早起源于()外汇市场。A.美国 B.法国 C.德国 D.英国
A.心下痞硬,干噫食臭,肠鸣下利者 B.心下痞硬满,引胁下痛,干呕短气头痛,汗
硫酸奎宁制备过程中可能存在“其他金鸡纳碱”。采用薄层色谱法进行检查,展开剂为A.
营运资金管理应该遵循的原则包括( )。A.满足正常资金需求 B.保证一定的盈利
经纬仪的主要功能是测量()。A.角度 B.距离 C.高差 D.高程
最新回复
(
0
)