首页
登录
职称英语
Our terrestrial food supply comes from ecosystems transformed to produce a f
Our terrestrial food supply comes from ecosystems transformed to produce a f
游客
2024-01-10
5
管理
问题
Our terrestrial food supply comes from ecosystems transformed to produce a few comestible species through the removal of competitors, predators, and pests, but marine capture fisheries depend on the overall productivity of natural ecosystems. There is, however, increasing concern about the impact of fishing and other human activities on marine ecosystems, which are now far from pristine. One option for moving toward both biodiversity and terrestrial food supply goals is to produce greater yields from less land, thereby freeing land for conservation purposes. By contrast, the objective of maintaining or resorting the biodiversity of marine ecosystems may conflict with the objective of maintaining or increasing our food supply from the sea, since the level of fishing required to achieve the latter may compromise the former. [br] The primary purpose of the passage is to
选项
A、examine the impact of certain research findings regarding changes to ecosystem biodiversity.
B、discuss a possible implication of a difference between terrestrial and marine food supply sources.
C、describe the consequences of a certain kind of interaction between terrestrial and marine ecosystems.
D、identify an area of ecosystem research in which here are significant uncertainties
E、present evidence that undermines one side of a debate about biodiversity and supports the other.
答案
B
解析
本题属于主旨题。本文的主旨便是通过将陆地生态系统和海洋生态系统进行对比,进而得到结论:海洋食物资源和生物多样性很难统一,因此选项B正确。A项文中未提及changes to ecosystem biodiversity。C项本文将海洋和陆地分别讨论,没有讨论两者之间的相互作用。D项从文中看不出significant uncertainties。E项文中没有辩论关于生物多样性。
转载请注明原文地址:https://tihaiku.com/zcyy/3349493.html
相关试题推荐
STRATIFY:A、homogenizeB、matureC、condenseD、reproduceE、exaltA
Ithasbeenarguedthatartdoesnotreproducethevisible-itmakes
Ithasbeenarguedthatartdoesnotreproducethevisible-itmakes
Ifaparticularvaccineisproducedonlybyonecompanyatasinglefacility,th
Forthepastfortyyearsithasbeenknownthattheammoniaproduced
Forthepastfortyyearsithasbeenknownthattheammoniaproduced
Forthepastfortyyearsithasbeenknownthattheammoniaproduced
ThepolarlightsknownasaurorasareproducedwhenchargedsubatomicLine
Bydefinition,teaisproducedfromtheleavesoftheCamelliasinensis,anever
Bydefinition,teaisproducedfromtheleavesoftheCamelliasinensis,anever
随机试题
WesternattitudestowardsthesocietiesofEastAsiaareasadreflectionofan
[originaltext]TodayI’dliketotalktoyouaboutgroupdiscussionswhich,
[originaltext](22)Moroccogetsmorethanahalfofitsenergyfromcoal.B
进行交叉作业时,下层作业的位置,必须确定处于上层高度可能坠落范围半径之外。不符合
病人,男,54岁,突然昏倒,口噤不开,面青身凉,舌苔白,脉迟有力,治疗应首选A.
A.代谢B.生物利用度C.排泄D.分布E.吸收药物从剂型中到达体循环的相对数量和
A.有效期为020215的药品 B.Expirydate C.Usebefo
从“横空出世”到随后的“星火燎原”再到近几年的“穷途末路”小灵通终于即将完成其历
劳动法律关系主体不包括()A:企业 B:个体经济组织 C:社会团体 D:劳
克服沟通障碍的途径包括()A.利用反馈 B.精简语言 C
最新回复
(
0
)