名词解释题低营养流生境 less nutrient flux habitat
名词解释题
低营养流生境 less nutrient flux habitat
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The destruction of habitats(栖息地)all over the world is the primary reason species are?becoming extinct(灭绝)or endangered．Houses,highways,dams,industrial buildings,and?ever-spreading farms now dominate?21?formerly occupied by forests,deserts,and wetlands．22?the beginning of European settlement in America,23,over 65,000,000 acres of?wetlands have been drained．One million acres alone vanished24?1985 and 1995．Habitat destruction can be?25?or it can be subtle,occurring over a26?period of time?without being noticed．27?such as sewage from cities and chemical runoff fromfarms,can change?the?28?and quantity of water in streams and rivers．To?29?living in a delicately balanced?habitat,this disturbance can be as30?as the clear-cutting of a rainforest．31?remaining habitats are carved into smaller and smaller pockets or islands,remaining?species are forced to exist in these?32?areas,which causes further habitat?33?These?species become less adaptable to environmental?34；in fact,they become?35?endangered．Scientists believe that when a habitat is cut by 90%,one-half of its plants,animals and insects will?become extinct．第34题的答案是（ ）A.improvementsB.ChangesC.protectionD.development
The destruction of habitats(栖息地)all over the world is the primary reason species are?becoming extinct(灭绝)or endangered．Houses,highways,dams,industrial buildings,and?ever-spreading farms now dominate?21?formerly occupied by forests,deserts,and wetlands．22?the beginning of European settlement in America,23,over 65,000,000 acres of?wetlands have been drained．One million acres alone vanished24?1985 and 1995．Habitat destruction can be?25?or it can be subtle,occurring over a26?period of time?without being noticed．27?such as sewage from cities and chemical runoff fromfarms,can change?the?28?and quantity of water in streams and rivers．To?29?living in a delicately balanced?habitat,this disturbance can be as30?as the clear-cutting of a rainforest．31?remaining habitats are carved into smaller and smaller pockets or islands,remaining?species are forced to exist in these?32?areas,which causes further habitat?33?These?species become less adaptable to environmental?34；in fact,they become?35?endangered．Scientists believe that when a habitat is cut by 90%,one-half of its plants,animals and insects will?become extinct．第35题的答案是（ ）A.evenB.farC.moreD.less
单选题In order to maintain a constant outlet water temperature of 80-85℃ from the engine, a three-way valve is installed（）Aat the jacket cooler outlet to control the flux through the engineBat the jacket cooler outlet to control the flux through the coolerCat the engine outlet to control the flux through the engineDat the engine inlet to control the flux through the engine
单选题Which statement most accurately describes the difference between the two passages?APassage 1 deals less directly with the exportation of chimpanzees than does Passage 2.BPassage 1 is less concerned with the interaction between man and the land than is Passage 2.CPassage I pertains to a species in its indigenous habitat while Passage 2 addresses the same animal in nonnative settings.DPassage I ends with an expression of optimism and Passage 2 does not.EPassage I introduces a species and describes its status worldwide, while Passage 2 limits its discussion of that species to its activities in the Northern Hemisphere.