海洋石油污染、赤潮已成为备受关注的海洋环境问题，据此回答5-6题。

5．在下列水域中最容易发生赤潮的是　　　　　 (　　 )

A．杭州湾　　 　 B．莱州湾 　　 C．辽东湾　　　　 D．珠江口

6.下列海域，若发生同等规模的海上原油泄漏，污染最严重的是　　 (　　 )

A.波斯湾　　　 B.几内亚湾　　　 C.孟加拉湾　　　 　 D.墨西哥湾

4.下列关于环境自净能力的说法不正确的是　　　　　　　　　　　　　　 (　　 )

A.虽然环境有自净能力，但人类把废弃物直接排放到自然环境中后，仍会对环境造成危害

B.污染物进入水体后，经一系列物理、化学和生物过程所净化，成为净化的天然水

C.河道中适量的藻类和其它绿色植物通过光合作用可以对水体起到一定的净化作用

D.地理环境的净化作用是有限的，污染物的排放一旦超过其自净能力，环境将趋于恶化

3.人类审视自己的社会经济行为和历程，认为可取的发展模式是(　　 )

A.先污染后治理　　　　　 B.高消耗.单纯追求经济增长数量

C.边污染边治理　　　　　 D.环境与发展相协调的可持续发展

2.环境问题的本质是(　　 )

A.人口问题　　 　　　 B.污染问题　　　　 C.资源问题　　 　　　 D.发展问题

1.生态系统变得日益简单和脆弱的时期最早出现在(　　 )

A.采猎文明时期　　　　　 B.农业文明时期　　

C.工业文明时期　　　　　 D.近20年来

100．Having read the last paragraph, we can conclude that ________.

　A. pride goes before a fall

　B. practice makes perfect

　C. no pains, no gains

99．The author advises readers to________.

　A. learn from himself, for he has a good way of teaching

　B. take pride in Carla’s fifth - grade teacher

　C. do as what Carla’s teacher did in educating children

　D. follow Carla’s example because she never fails in the test

98．The article gives us a good suggestion about how to evaluate(评价)your child’s work at home. That is to ________.

　A. praise his success　　　　 B. promise him a trip

　C. give him a punishment　　　 D. promise him a ball game

97．The author thinks that________.

　A. there is no way to get children to help at home

　B. the more encouragement and praise you give, the more responsible and helpful children will become

　C. it is very difficult to make children responsible for housework

　D. children can be forced to help with housework

96．The whole passage deals with ________.

　A. social education　　　　B. school education

　C. family education　　　　D. pre - school education