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2. 英语中的元音[a:]在用于[f]，[w], [s]或鼻音前时，美语发为[æ]。但在字母组合-lm前发音不变仍为[a:]。
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Read the following passage：
After Charles had left the country, he started to farm in Derbyshire. This was different from marching past a sergeant.
“I can’t play cards now,” thought Charles. “I can’t go to dances, nor laugh with my comrades-in-arms. But I shan’t break my heart,” he laughed. “I have a car, and life is sweet and calm.”
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Betty bought a bit of butter, “But” said she “this butter is bitter. If I put it in my batter, it will make my batter bitter” So, She bought some better butter, better than the bitter butter, and it made her bitter batter better.