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问题 问答题

填写物质的名称或化学式

物质名称 水银氯化钡 石碱
化学式N2  CH4 

答案

根据化合价的原则（在化合物中正、负化合价的代数和为零）和化合价数值交叉法书写化学式（即将正、负化合价的数值交叉到相应符号的右下角，但注意原子团看作一体，含约数的一般要约分）；熟记并学会记忆常用物质的名称和化学式．

氮气甲烷
HgBaCl2Na2CO3?10H2O

听力题

根据句意及首字母或汉语提示，写出各句中所缺单词的正确形式。

小题1:With the d____ of economy, people’s living standards are improved now.

小题2:The reason he gave to a_____ for his absence was unbelievable.

小题3:Our farm s_____ the market with fruits and vegetables every day.

小题4:My teacher is a strict man and he has no s_____ of humor.

小题5:They shouldn’t treat their mother in a rude m______. They should respect her.

小题6:We are in the _____ （少数）; more people are against us than with us.

小题7:Peter will _____ (逐渐地) get used to the weather in China.

小题8:They stood there, _____ （怒视） at each other without a word.

小题9:This factory will bring _____ （好处）to the people around it.

小题10:We had a light _____ （误解） with them last night.
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