9、请注意选择题“正确的是”，“错误的是”两种不同要求。请注意，做的正确，填卡时却完全填反了，要十分警惕这种情况发生。

8、计算题中往往出现“将样品分为两等份”(或“从1000mL溶液中取出50mL”)，最后求的是“原样品中的有关的量”，你却只求了每份中的有关量。

7、273℃与273K不注意区分，是“标况”还是“非标况”，是“气态”还是“液态”“固态”不分清楚。22 .4L.mol^-1的适用条件。注意三氧化硫、乙烷、己烷、水等物质的状态。区分液态氯化氢和盐酸，液氨和氨水，液氯和氯水。

6、所有的稀有气体都是单原子分子而误认为双原子分子。

5、要求写“名称”却写分子式或其他化学式，要求写分子式或结构式却写名称。电子式、原子或离子结构示意图、结构简式、结构式不看清，张冠李戴。要求写离子方程式而错写成化学方程式。

4、有单位的要写单位，没有单位的就不要写了。如“溶解度”单位是克，却不写出，“相对分子质量”、“相对原子质量”无单位，却加上“g”或“g.mol^-1”。摩尔质量有单位(g.mol^-1)却不写单位，失分。

3、别忽视题干中 “混合物”、“化合物”、“单质”等限制条件。

2、书写化学方程式时，分清是 “　 　”还是“”，如一种盐水解方程式一定用“”不能用“　 ”，其产物也不能标“↓”或“↑”，弱酸、弱碱的电离一定要用“”不能 用“　 ”。

48. successful　 　　49. problem 　　　50. but　 　　51. forward　 　　　52. fan

[书面表达]

One possible version:

Hello, everyone. Today I’m going to tell you a story entitled “A Retired Captain”.

Capital Black became bored with is retired life. He wanted to develop some new interests in his late life. After breakfast one morning, he put on his old uniform and felt he was young again. He quickly packed his suitcase and kissed his wife goodbye. He left home in high spirits, as if he were ready to lead his crew across the sea. Soon, he started his new voyage, playing with an electronic boat by the riverside. Captain Black enjoyed playing no less than the children watching around him.

My story tells us that old people should try to make their life as colorful as possible so as to keep themselves healthy both mentally and physically.