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 are declining or have become extinct. They have been around for a long time - over 350 million years. Why are they dying out now? 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? 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 amphibians. Another factor is that air pollution has led to increased levels of ultraviolet 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 amphibians in different parts of the world. 36 Losing amphibians means losing B knowledge about air and water pollution. D an opportunity to detect poisonous gases. A in any stream they can find, C only on sand. 38 The arroyo toad is disappearing because B it is losing its habitat. D it cant bear the cold of winter. A poisonous gases. C water leakage. 40 Scientists think that the decline of amphibians could B cause a decline in other kinds of animals. D be a good sign for human beings.
上一篇: 职称英语综合类阅读理解练习题2
下一篇: 职称英语综合类阅读理解练习题12
梦醒时分迎朝阳
不走寻常路
二十国集团领导人布里斯班峰会公报(双语)[1]
国内英语资讯:China supports UN, WHO playing due roles in global anti-epidemic cooperation: Xi
不走寻常路
做个快乐的发现者
送你一轮明月
我想要去流浪
国内英语资讯:Xi Focus: Xi chairs leadership meeting to discuss draft government work report
国内英语资讯:Xi calls for more international support for Africas COVID-19 fight
国内英语资讯:China urges consistent efforts to keep COVID-19 from rebounding
国际英语资讯:Italys active COVID-19 infections continue downward trend, as govt mulls reopening inter
打网球,太棒了!
送你一轮明月
习近平在亚太经合组织工商领导人峰会开幕式上的演讲(双语摘要)
体坛英语资讯:Chinas Wu Lei confident of future career despite Covid-19 infection
战胜自己
我们一起走过
体坛英语资讯:Tokyo 2020 chief says new dates for Olympics could be set next week
国际英语资讯:Feature: Lebanese young man survives COVID-19 via optimism, psychological support