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.
2015考研英语阅读奥巴马的表现
2015考研英语阅读太空时代的结束
2015考研英语阅读富国穷国和弱国
2015考研英语阅读人民币投资利物浦
2015考研英语阅读性别选择
2015考研英语阅读政治会议发动群众
2015考研英语阅读邮政局
2015考研英语阅读幸灾乐祸
2015考研英语阅读读博是浪费时间
2015考研英语阅读现实比电影好得多
2015考研英语阅读家乐福摇摇欲坠
2015考研英语阅读遣返赖昌星
2015考研英语阅读创智财富
2015考研英语阅读移民问题
2015考研英语阅读印度的反腐败抗议
2015考研英语阅读肠道细菌可影响情绪
2015考研英语阅读中国高铁追尾
2015考研英语阅读人民币的崛起
2015考研英语阅读美国西南航空公司
2015考研英语阅读令人陶醉的发现
2015考研英语阅读无望的日本政治
2015考研英语阅读香港的抗议
2015考研英语阅读日本武士走向没落
2015考研英语阅读中国经济正分裂
2015考研英语阅读美国佬的幸福婚姻
2015考研英语阅读平息暴乱
2015考研英语阅读同性恋婚姻
2015考研英语阅读月球的历史
2015考研英语阅读红底鞋之争
2015考研英语阅读麦田怪圈
不限 |
英语教案 |
英语课件 |
英语试题 |
不限 |
不限 |
上册 |
下册 |
不限 |