过氧化氢异丙苯分解为苯酚和丙酮，一般用酸性催化剂。
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A. Two weeks.
B. Three weeks.
C. Four weeks.
D. Five weeks.
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A. Six.
B. Eight.
C. Ten.
D. Twelve.
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A. They may go to conferences.
B. They may stay at home.
C. They may go to Spain or Greece.
D. They may go to seaside resorts built in the railway age.
[音频]
A. The cold sea.
B. Expensive hotel costs.
C. The uncertain weather.
D. Too many conferences being held there.
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