2019年湖南成人高考专升本语文复习用书

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

“谈虎色变”属于哪类反射活动（ ）

A.无条件反射
B.非条件反射
C.第二信号系统的条件反射
D.第一信号系统的条件反射

“学而时习之”、“温故而知新”体现了( )

A.巩固性的教学原则
B.循序渐进的教学原则
C.直观性的教学原则
D.启发性的教学原则