The destruction of habitats(栖息地)all over the world is the primar

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 vanished 24?1985 and 1995． Habitat destruction can be?25?or it can be subtle,occurring over a 26?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 as 30?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33题的答案是（ ）
A、reform
B、destruction
C、Support
D、discovery
【正确答案】：B
【题目解析】：第33题的正确答案是B，即“destruction”。 根据原文，该句提到“remaining habitats are carved into smaller and smaller pockets or islands, remaining species are forced to exist in these...areas, which causes further habitat destruction”。意思是，剩余的栖息地被分割成越来越小的区块或岛屿，剩余物种被迫在这些区域中生存，这导致了栖息地的进一步破坏。 因此，根据上下文，可以确定该空格应填入的单词为“destruction”，即“破坏”之意。其他选项“reform”（改革）、“support”（支持）和“discovery”（发现）在此上下文中都不适用。所以正确答案是B。