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
11
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
Arewereadyforthelibraryofthefuture?A)Librarianstodaywilltel
某化工厂生产的液体的性质为水溶性,其发生火灾后,可以使用()灭火。A.液
胃次全切除的病人引起贫血与下列哪些因素有关A.Fe B.维生素B C.维生素
幽门螺杆菌根除治疗的适应证不包括A.慢性胃炎反复发作伴幽门螺杆菌感染 B.消化
股权投资基金投资顾问从事投资顾问活动,不得有的行为包括()。 Ⅰ.泄露委托人
中医药事业的动力是()。A.辨证施治B.创新C.研究药物组成规律D.继承并发展
共用题干 刘先生请理财规划师为他的子女教育规划。他的孩子还有5年上大学,现在大
小儿头围与胸围两者几乎相等的年龄是A:3个月 B:5个月 C:9个月 D:
噻嗪类利尿剂的主要不良反应是A.足踝部水肿 B.血尿酸升高 C.直立性低血压
涵洞拱圈砌筑砂浆或混凝土强度达到设计强度的()时,方可拆除拱架,达到设计强度后
最新回复
(
0
)