首页
财务会计
医药卫生
金融经济
考公考编
外语考试
学历提升
职称考试
建筑工程
IT考试
其他
登录
财务会计
共用题干 第二篇Where Have All the Frogs Gone?I
共用题干 第二篇Where Have All the Frogs Gone?I
Freeti
2019-12-17
3
问题
共用题干第二篇
Where Have All the Frogs Gone?
In the 1980s,scientists around the world began to notice something strange:Frogs
were disappearing. More recent research has shown that many kinds of amphibians(两栖
动物)are declining or have become extinct. They have been around for a long time一over
350 million years.Why are they dying out now?
Scientists are seriously concerned about this question.First of all,amphibians are an
important source of scientific and medical knowledge.By studying amphibians,scientists
have learned about new substances that could be very useful for treating human diseases.
Further research could lead to many more discoveries,but that will be impossible if the
amphibians disappear.
The most serious aspect of amphibian loss,however,goes beyond the amphibians
themselves.Scientists are beginning to think about what amphibian decline means for the
planet as a whole.If the earth is becoming unlivable for amphibians,is it also becoming
unlivable for other kinds of animals and human beings as well?
Scientists now believe that amphibian decline is due to several environmental factors.
One of these factors is the destruction of habitat,the natural area where an animal lives.
Amphibians are very sensitive to changes in their habitat.If they cannot find the right
conditions,they will not lay their eggs一These days,as wild areas are covered with
houses,roads,farms,or factories,many kinds of amphibians are no longer laying eggs.
For example,the arroyo toad(蟾蜍)of southern California will only lay its eggs on the
sandy bottom of a slow-moving stream.There are very few streams left in southern
California,and those streams are often muddy because of building projects. Not
surprisingily,the arrovo toad is now in danaer of extinction.
There are a number of other factors in amphibian decline.Pollution is one of them.In
many industrial areas,air pollution has poisoned the rain,which then falls on ponds and
kills the frogs and toads that live there,In farming areas,the heavy use of chemicals on
crops has also killed off arrtphibians.Another factor is that air pollution has led to increased
levels of ultraviolet (UV) light. This endangers amphibians, which seem to be especially
sensitive to UV light. And finally, scientists have discovered a new disease that seems to
be killing many species of arnpttibians in different parts of the world.
All these reasons for the disappearance of amphibians are also good reasons for more
general concern. The destrriction of land, the pollcition of the air and the water, the
changes in our atmosphere, the spread of diseases-these factors affect human beings,
too. Amphibians are especially sensitive to environmental change. Perhaps they are like
the canary (金丝雀)bird that coal miners once used to take down into the mines to detect
poisonous gases. When the canary became ill or died,the miners knew that dangerous
gases were near and their own lives were in danger.
选项
Losing amphibians means losingA:knowledge about fatal human diseases.B:knowledge about air and water pollution.C:a chance to discover new medicines.D:an opportunity to detect poisonous gases.
答案
C
解析
转载请注明原文地址:https://ti.zuoweng.com/ti/IPnNKKKQ
相关试题推荐
共用题干 (一)资料2011年3月,某审计组对丙公司2010年度财务收支情况进
共用题干 (一)资料2012年3月,某审计组对甲公司2011年度财务收支情况进
共用题干 (一)资料2013年2月,某审计组对甲公司2012年度财务收支情况进
共用题干 (一)资料企业2010年末的资产总额为9900万元,其中:货币资金5
共用题干 (一)资料乙公司为增值税一般纳税人,适用的增值税税率为17%。201
共用题干 某企业拟购买一种债券作为短期投资,该债券面值1000元,5年后到期,
共用题干 (一)资料甲公司为制造企业,属于增值税一般纳税人,适用的增值税税率为
共用题干 某银行20x5年第一季度发生以下经济业务:1.取得人民币贷款利息收入
共用题干 某公司预算期年初产品存货为1000件,预算期销售量预计为80000件
共用题干 (一)资料甲公司2011年年初产品存货成本为300000元,2011
随机试题
37.结合材料回答问题 2015年五一劳动节前夕,央视新闻频道播出了《大
某内部审计师在进行审计时发现,某部门的业务程序没有按照公司章程中的规定予以实施,
(1-4题共用备选答案) A.给予适当的刺激 B.给予强有力的刺激 C.选
下列混合固定液虽有氧化剂和还原剂,但可以临用时配制,久置后则失效的是 A.Bo
下列有关环境公益诉讼说法正确的是:()
将同一性质的作业,由纵向分工改为横向分工的劳动作业改进方式是()。
施工企业在工程投标及签订合同阶段编制的估算成本计划,属于( )成本计划。2016A、指导性B、实施性C、作业性D、竞争性
9岁的小明看到动画片中小偷在偷东西,就对妈妈说,好孩子不应该偷东西,根据科尔伯格的道德发展阶段论,小明的道德发展处在()。A.寻求认可定向阶段B.惩罚与服从
期货公司对外发布的广告宣传材料,应当自发布之日起()工作日内报住所地的中国证监会派出机构备案。A:3个B:5个C:7个D:10个
下列项目中,会使借款费用资本化金额增加的有( )。A.在建一年的厂房占用的专门借款产生汇兑损失B.符合资本化条件的无形资产研发支出占用的一般借款资本化期间的借