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2.Frogs,toads and salamanders usually make us think of green,slimy little monsters.These monsters actually belong to a very special class of animals called the amphibians.Amphibians can live both on land and in the water.They commonly inhabit ponds,rivers,marshes and other wetlands.
Today,amphibians are becoming extinct very quickly from all the six continents where they are found.More than 25countries are reporting sharp drops in the populations of amphibians.In some places,embryos (胚胎) are dying; in others,adults are missing.Why are they dying off?
Scientists blame human interference.Industrial waste and toxic gases given out by factories,manufacturing plants and cars are steadily poisoning the breeding grounds of amphibians.Chemicals such as sulphur dioxide rise high into the atmosphere and mix with rain.This makes the rain acidic and thus kills off delicate amphibian embryos.
More rare species of amphibians are already gone.Costa Rica's Golden toads have not been seen since 1989.The Australian Gastric Brooding frogs are extinct.Leopard frog numbers are dropping in the Rocky Mountains.Leopard frogs live in the wetland regions in these areas.The wetlands are being drained to make way for highways,industry and new housing.
Another threat to the amphibians is the increased ultraviolet radiation.Ultraviolet rays come from the sun and are extremely harmful to living things.They can cause skin cancer in humans.Luckily for us,ultraviolet rays are blocked by a thick layer of ozone above the earth's atmosphere.Ozone is a special kind of oxygen which absorbs ultraviolet radiation.Now,the ozone layer is being destroyed by chemicals called CFC's which are given off by factories.A hole in the ozone layer was discovered over Antarctica in the late 1980's.As a result,more ultraviolet rays are reaching the earth and more amphibians are dying.
Just as the emergence of new infectious diseases such as Bird Flu are a threat to human and animal populations across the world,amphibian species are also facing their most significant threat from a little understood disease.A chytrid fungus is understood to be of the major causes of frog death across the world.
(Note:Answer the questions or complete the statements in NO MORE THAN TWELVE WORDS)

81.The sharp drops in the populations ofamphibians from over 25 countriesindicate that amphibians are dying out quickly.
82.What's the destructive force of acid rain?It kills off delicate amphibian embryos..
83.The ozone layer protects people byabsorbing/blocking the (harmful) ultravioletradiation.
84.List at least two major factors that lead to the extinction of amphibians.Human interference,increased ultravioletradiation and new infectious diseases.

分析 本文主要讲述两栖动物正在快速灭绝的原因.

解答 81.The sharp drops in the populations ofamphibians from over 25 countries
82.It kills off delicate amphibian embryos.
83.absorbing/blocking the (harmful) ultravioletradiation 
84.Human interference,increased ultravioletradiation and new infectious diseases
81.The sharp drops in the populations ofamphibians from over 25 countries  细节题. More than 25 countries are reporting…"说明了两栖动物数量急剧下降,濒临灭绝这一事实."The sharp drops in the populations of amphibians from over 25 countries"符合题意,在句中作主语
82.It kills off delicate amphibian embryos.细节题.由第三段"This makes the rain acidic and thus kills off delicate amphibian embryos"可知酸雨对两栖动物的破坏性力量在于它会杀死动物的胚胎.
83.absorbing/blocking the (harmful) ultravioletradiation  细节题. Luckily for us,ultraviolet rays are blocked by a thick layer of ozone above the earth's atmosphere"可知臭氧层能够阻挡紫外线,防止人们晒伤.absorbing/blocking the (harmful) ultraviolet radiation 与此表意一致.
84.Human interference,increased ultravioletradiation and new infectious diseases   细节题.文中指出了两栖动物濒临灭绝的三点原因,由第三段、第五段及最后一段可得关键词:human interference、increased ultraviolet radiation 及 new infectious diseases.

点评 做阅读表达题时,理清文章的脉络、掌握文章的主旨大意,并能运用简洁的语言表达.回答要有针对性观点要明确.不要摘抄文章原句.

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