首页
外语
计算机
考研
公务员
职业资格
财经
工程
司法
医学
专升本
自考
实用职业技能
登录
外语
Should we care if over 150 known species of animals have【C1】______from the earth in the last fifty years? Should we be concerned
Should we care if over 150 known species of animals have【C1】______from the earth in the last fifty years? Should we be concerned
admin
2019-01-06
50
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."
【C17】
选项
A、upon
B、to
C、with
D、from
答案
A
解析
这个词应与后面的rely搭配,即rely upon“依靠”。
转载请注明原文地址:https://kaotiyun.com/show/k8UO777K
0
考博英语
相关试题推荐
Therearetwobasicwaystoseegrowth:oneasaproduct,theotherasaprocess.Peoplehavegenerallyviewedpersonalgrowtha
Ifyouintendusinghumorinyourtalktomakepeoplesmile,youmustknowhowtoidentifysharedexperiencesandproblems.Your
Scientistshopethecollisionwillproducealargecraterinthecomet’ssurfaceinordertorevealthecoreandgivesome______
Largeanimalsthatinhabitthedeserthaveevolvedanumberofadaptationsforreducingtheeffectsofextremeheat.【C1】______ad
Inthezanycomedyseries1LoveLucy,LucilleBall’sexaggerated,clumsyanticsdisplayedthecomedian’sfamoustalentfor_____
Islanguage,likefood,abasichumanneedwithoutwhichachildatacriticalperiodoflifecanbestarvedanddamaged?Judgin
Hedoesn’tseemtobeableto______anyinterestinhisstudies.
Shehas______somebrilliantschemetodoubleherincome.
Heisawell-trainedmusicianwhocanperceiveverysmalldifferencesinsound.
Musiciansarefascinatedwiththepossibilitythatmusicmaybefoundinnature;itmakesourowndesireforartseemallthemo
随机试题
根据IS-LM模型,影响货币政策效应的主要因素是IS、LM曲线的斜率。在LM曲线斜率一定的条件下,如果IS曲线斜率小(即曲线平坦),则货币政策的效应就大。()[2010年真题]
商业银行的重大风险事项包括()。
建设工程项目风险应对策略包括()。
下列成语典故与军事无关的一项是:
建筑是凝同的诗:____;____。诗有古诗和现代诗,建筑也有古今之分,泾渭分明。在缓缓流逝的时间长河中,总有一些记忆像卵石般沉淀下来,____,____。爱.特别是母爱,对他来说,就是这样一份沉甸甸的卵石。①或神采飞扬,透着现代的气息②或庄重沉稳,带
简述平均数、中数与众数的含义及三者的关系。
Whomostlikelyisthespeaker?
Sheshouldhirea(efficient)______clerkthantheoneshecurrentlyhas.
Vitamins,likeminerals,arechemicals.Thereisabsolutelynotdifferenceinthechemicalstructure【S1】______ofthenatu
Forthispart,youareallowed30minutestowriteanessaycommentingontheremark"AreWesternFestivalsUnderminingChinese
最新回复
(
0
)