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30题的答案是（ ）
A、effective
B、small
C、fatal
D、surprising
【正确答案】：C
【题目解析】：在第30题的语境中，句子提到“To those living in a delicately balanced habitat, this disturbance can be as [30] as the clear-cutting of a rainforest.”，这里的关键词是“delicately balanced habitat”和“clear-cutting of a rainforest”。前者指的是一个微妙平衡的栖息地，任何微小的扰动都可能对其造成重大影响；后者指的是雨林的大规模砍伐，这是一种极具破坏性的行为。 因此，此处的填空应表示与雨林砍伐一样具有“严重”、“破坏性强”或“致命”的意义。从给定的选项中： A. effective - 有效的 B. small - 小的 C. fatal - 致命的 D. surprising - 令人惊讶的 选项C“fatal”最能体现与雨林砍伐相同级别的破坏性和严重性。而其他选项与这一语境不符。所以答案是C。