首页
登录
职称英语
Since life began eons ago, thousands of creatures have come and gone. Some,
Since life began eons ago, thousands of creatures have come and gone. Some,
游客
2024-01-02
34
管理
问题
Since life began eons ago, thousands of creatures have come and gone. Some, such as the dinosaurs, became extinct due to naturally changing ecologic conditions. More recent threats to life forms are humans and their activities. Man has drained marshes, burned prairies, dammed and diverted rivers. Some of the more recent casualties of man’s expansion have been the dodo, great auk, passenger pigeon, Irish elk, and Steller’s sea cow. Sadly, we can no longer attribute the increasing decline in our wild animals and plant species to "natural" processes. Many species are dying out because of exploitation, habitat alteration or destruction, pollution, or the introduction of new species of plants and animals to an area. As mandated by Congress, protecting endangered species, and restoring them to the point where their existence is no longer jeopardized, is the primary objective of the U.S. Fish and Wildlife Service’s Endangered Species Program. [br] Which of the following is a form of man’s habitat alteration?
选项
A、Glacial encroachment.
B、Hurricanes.
C、Dammed rivers.
D、Snowstorms.
答案
C
解析
见文中第三、四句:More recent threats to life forms are humans and their activities. Man has drained marshes,burned prairies,dammed and diverted rivers.各种生物近期遇到的威胁更多来自于人类:人类耗干了湿地、烧毁了大草原、筑坝并让河流改道。因此C.“人类生活环境变迁的一种形式是在河流上筑坝。”为答案,其余A.“冰川侵蚀”、B.“飓风”和D,“暴风雪”均是自然现象。
转载请注明原文地址:https://tihaiku.com/zcyy/3326338.html
相关试题推荐
Sincelifebeganeonsago,thousandsofcreatureshavecomeandgone.Some,
Sincelifebeganeonsago,thousandsofcreatureshavecomeandgone.Some,
Sincelifebeganeonsago,thousandsofcreatureshavecomeandgone.Some,
Sincelifebeganeonsago,thousandsofcreatureshavecomeandgone.Some,
Alllivingcreaturespassoninheritedtraitsfromonegenerationtoother.A、the
Alllivingcreaturespassoninheritedtraitsfromonegenerationtoother.A、the
Sincelifebeganeonsago,thousandsofcreatureshavecomeandgone.Some,
Sincelifebeganeonsago,thousandsofcreatureshavecomeandgone.Some,
Sincelifebeganeonsago,thousandsofcreatureshavecomeandgone.Some,
Fewcreaturesonearthareascuteastheblackliontamarin,andfewhavea
随机试题
[originaltext]IrunadesignstudioinNewYork.Everysevenyears,Iclose
Thekeyelementtosuccessfulinterviewingisnotyourexperience,yourgrad
Art,saidPicasso,isaliethatmakesusrealizethetruth.Soisamap~We
PassageOneAmongthegreatcitiesoftheworld,Kolkata(formerlyspelt
大型预应力构件、特种结构和构筑物的施工多采用()。 A、单根粗钢筋锚具方法
共用题干 第二篇CrystalEarOnedayafriendask
专供揉搽皮肤表面用的液体制剂称为A:合剂 B:乳剂 C:搽剂 D:涂剂
以下关于室内消火栓的设置规定,正确的是()。A.高层建筑、厂房、库房和室内净空
植树节某班20名同学在一段直线公路一侧植树,每人植一棵,相邻两棵树相距l0米,开
蜜丸在贮存中应注意事项有A.防潮 B.置阴凉处 C.防霉变 D.防虫蛀
最新回复
(
0
)