1I.话题与高考阅读理解Food webs may be dominated by many weak links because that(2019·天津高考·C)arrangement is more stable over the long term. If a predatorHow does an ecosystem(生态系统) work? What makescan eat several species,it can survive the extinction(灭绝) ofthe populations of di...
A. The ecosystem will always be better. B. The ecosystem will always be worse. C. It might disrupt the ecological balance. D. Nothing will change. 相关知识点: 试题来源: 解析 C。如果一个新物种被引入生态系统,可能会破坏生态平衡,因为新物种可能没有天敌,会大量繁殖,或者与原有的物种竞争资源等...
extraelectricitycanbeusedtodrivetheelectrolysisofwater,“storing”theelectricityintheform ofhydrogen.Second,electrolyzersaregettingmoreefficient. Currentrenewabletechnologiessuchassolarandwindpowercandecarbonize(脱碳)the energysectorbyasmuchas85percentbyreplacinggasandcoalwithcleanelectricity.Otherparts oftheeconomy,suc...
【题目】An ecosystem consists of the living and nonliving things in an area ___ interact with one another. A.that B.where C.who D.what 试题答案 在线课程 【答案】A 【解析】句意:一个生态系统由一个区域内的可以相互作用的生物和非生物成的。根据句意可知,___ interact with one another是定语...
And unplanned human activities have proved the idea of top-down control by top predators to be true. In the ocean, we fished for top predators such as cod on an industrial scale, while on land, we killed off large predators such as wolves. These actions have greatly affected the ecological...
What can we do to protect the balance of an ecosystem? A. Reduce pollution. B. Conserve water resources. C. Protect wild habitats. D. All of the above. 相关知识点: 试题来源: 解析 D。解析:我们可以通过减少污染、保护水资源以及保护野生栖息地等方式来保护生态系统的平衡。污染会破坏生态环境,...
解析 B。解析:在生态系统中,捕食者有助于控制猎物的数量(helps control the population of the prey),从而维持生态平衡。捕食者不会使猎物灭绝(makes the prey extinct),它对其他物种是有影响的(has no effect on other species错误),也不是只和其他捕食者竞争(only competes with other predators)。
Windfarmshavebeenconsideredastheway tofightglobalwarming,butanewstudysuggests theycouldactuallyheattheplanetup. Thestudyfound thatthe US would get warmerifthenumberofturbines(涡轮机)were increased markedly.Researcherssaythey?llrequire much morelandthanpreviouslythought, needingfiveto20timesmorespacethanearlier ...
And unplanned human activities have proved the idea of top-down control by top predators to be true. In the ocean, we fished for top predators such as cod on an industrial scale, while on land, we killed off large predators such as wolves. These actions have greatly affected the ecological...
分析句子结构可知,“___ interact with one another”是定语从句,修饰先行词“the living and nonliving things”,故排除D项,“what”不能用于定语从句.在该定语从句中,谓语动词“interact”前缺少主语,因此排除B项.“that”既可以代指人,也可以代指物,“who”只能代指人,根据中的先行词是“the living and non...