首页
登录
职称英语
Should we care if over 150 known species of animals have【C1】______from the e
Should we care if over 150 known species of animals have【C1】______from the e
游客
2023-12-27
31
管理
问题
Should we care if over 150 known species of animals have【C1】______from the earth in the last fifty years? Should we be concerned that there are【C2】______thousands of species whose very existence is【C3】______endangered—largely because of our activities?【C4】______, after all, is the natural end of populations. Species are born, then【C5】______, and then die. Some live a【C6】______time, perhaps millions of years; some die more quickly. We have【C7】______the extinction of many species we know about, and we have undoubtedly sealed the【C8】______of others. In fact, there are undoubtedly many other species that have lived among us during our time on earth, but that have disappeared as a(n) 【C9】______of our activities without our ever having known they existed.
It is hard to explain the rationale of many of us who are concerned about such matters. I have never seen a sea whale,【C10】______I don’ t want them to become extinct. Moreover, I felt this way long before I understood anything about how they might be an important part of an ecosystem. Possibly such feelings merely reflect the cultural attitude that it is "nice" to wish other living things well; thus, the attitude is【C11】______. I feel nice.
There are, of course, more rational reasons for【C12】______the extermination of any species. For one thing, the kind of attitude that encourages or sanctions the destruction of other species is a threat【C13】______our own wellbeing. If such an attitude exists, we ourselves might【C14】______victim to it. living things(including us)might be expected to fare better where there is【C15】______for life. The extinction of other species could also threaten us【C16】______by simplifying the system of which we are a part or by destroying parts of the ecosystem【C17】______which we directly rely. For example, if we continue to poison the oceans【C18】______we are willing to believe only a few bottom dwellers are affected, we might【C19】______overstep some critical threshold and trigger the wholesale death of plankton, thus finding ourselves without a major【C20】______of the world’s food and with our oxygen supplies dwindling. [br] 【C20】
选项
A、source
B、maker
C、creator
D、resources
答案
A
解析
source of the world’s food世界食物的来源。
转载请注明原文地址:https://tihaiku.com/zcyy/3308623.html
相关试题推荐
UnderwhatcircumstanceswouldBobreplacehim?[br][originaltext]Ifheshould
UnderwhatcircumstanceswouldBobreplacehim?[br][originaltext]Ifheshould
UnderwhatcircumstanceswouldBobreplacehim?[br][originaltext]Ifheshould
UnderwhatcircumstanceswouldBobreplacehim?[br][originaltext]Ifheshould
UnderwhatcircumstanceswouldBobreplacehim?[br][originaltext]Ifheshould
UnderwhatcircumstanceswouldBobreplacehim?[br][originaltext]Ifheshould
UnderwhatcircumstanceswouldBobreplacehim?[br][originaltext]Ifheshould
UnderwhatcircumstanceswouldBobreplacehim?[originaltext]Ifheshouldfail
Whatcausedgreatmigrationsofanimalsandplants?[br][originaltext]Duringt
Whatcausedgreatmigrationsofanimalsandplants?[originaltext]Duringthepas
随机试题
A—TOPStoriesB—E-newslettersC—CurrentSpeci
Thenationsbiggestretailersreportedstrongsalesduringthelastsixmonths.
Questions1-4Thetexthas9paragraphs(A-I).Whichparagraphcontainseachof
TheInternethasbecomeacommonplaceforus.While【C1】______theInternet,we
雨水口及支管的施工质量要求之一为:雨水管端面应露出井内壁,其露出长度不得大于5c
下列哪项不是链接CAD界面后可选择的颜色显示方式?()A.彩色 B.黑白 C
粪便特征是量多,泡沫状,呈灰白色,有光泽恶臭,镜检时可见较多的脂肪小滴,最有可能
A.医学科研道德是医学科研的动力源泉 B.医学科研是有意识、有目的的,是对研究
所谓“治理”,一个很重要的方面是“建设”,这是社会治安综合治理工程的一项积极措施
法的效力层级规定了上位法与下位法的法律地位与效力,下列说法中正确的是()。A.《
最新回复
(
0
)