Last year, my best friend, Li Xiaoming, talked about the best way of studying English. At first he thought the teacher spoke 1quickly2he didn't understand. He also3 ask questions4 his poor pronunciation. Then he began to watch English movies, he 5 funny movies.6 he couldn't understand everything the characters said,7he can get the meaning by watch body language and expressions. He also realized he could get the meaning by8 for the key words. His pronunciation improved as well by listening to the conversations in English movies. Sometimes he learned some9sentences like “It's a piece of cake.” At last he often 10 the new words in the dictionary.

家庭生活中制作食品经常用到碳酸钠（苏打）和碳酸氢钠（小苏打），碳酸氢钠不稳定，在潮湿空气中缓慢分解，受热至65℃以上迅速分解，270℃时完全分解为碳酸钠．某同学为探究它们的性质差异，设计了如图所示装置进行实验．

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