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25题的答案是（ ）
A、simple
B、beneficial
C、interesting
D、obvious
【正确答案】：D
【题目解析】：第25题问的是栖息地的破坏可能是怎样的。根据语境，栖息地的破坏可以是明显的（obvious），也可以是微妙的，需要一段时间才能被注意到。因此，我们需要选择一个能描述栖息地破坏明显特征的形容词。 A选项“simple”表示简单的，这并不符合语境，因为栖息地的破坏可能是一个复杂的过程，不仅仅是简单的。 B选项“beneficial”表示有益的，这与栖息地破坏的负面含义相悖。 C选项“interesting”表示有趣的，这同样不符合语境，因为问题关注的是栖息地破坏的严重性，而不是其是否有趣。 D选项“obvious”表示明显的，这符合语境，因为栖息地的破坏有时是可以明显看到的，比如森林被砍伐、湿地被填埋等。 因此，根据语境和选项的含义，正确答案是D。