3.下列关于溶液和胶体的叙述，正确的是　　　　　　　　　　　　　　　 (　 )

A．一束光线分别通过溶液和胶体时，后者能看到一条光亮的“通路”，前者则没有

B．溶液是电中性的，胶体是带电的

C．溶液中溶质分子可以通过滤纸，胶体中分散质粒子则不能通过滤纸

D．通电时，溶液中的溶质粒子分别向两极移动，胶体中的分散质粒子向某一极移动

2.下列说法中正确的是　　　　　　　　　　　　　　　　　　　　　　　 (　 )

A．硫酸、纯碱、醋酸钠和生石灰分别属于酸、碱、盐和氧化物

B．蔗糖、硫酸钡和水分别属于非电解质、强电解质和弱电解质

C．Mg、Al、Cu可以分别用置换法、直接加热法和电解法冶炼得到

D．沼气、天然气和水煤气分别属于化石能源、可再生能源和二次能源

1．2009年夏秋季节，甲型H1N1流感出现抬头迹象，为了防控甲型H1N1，下列不属于疾控部门要求使用的用品是　　　　　　　　　　　　　　　　　　 (　 )

A．食盐水　　 　　　B．清洁剂　　　　 C．次氯酸钠　　　　 D．70%酒精

84. Differences in habitat could lead to different living habits.

参考范文：

Nowadays,most of my classmates aren’t willing to communicate with their parents or share their inner thoughts with their parents and always find it hard to seek support and advice from them, the reason of which is that they feel that they are not equal in position and parents lay too much emphasis on the children’s study.

In my opinion,the relationship between parents and children should be one filled with love, care and understanding, in which parents and children are equal and they can show respect for each other and exchange ideas freely. To build a relationship of this kind , parents should become friends of their children while children ought to place more trust in their teachers and give voice to their inner feelings frankly. Only in this way can we enjoy a warm relationship between parents and children.

(132 words)

83. They lock their feet around a branch.

82. By changing its body colors.　

81. 8.

78. about widening divisions　 79. the government’s power　　　 80. Comments

75. Best-known books　　　 76. The Affluent Society　　　　　 77.road plan　

71. Two influential thinkers　 72. Names　　 73. April twenty-ninth　　 74.Status