题目内容

There are two girls playing () happily with beautiful flowers and green trees surrounding them.

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() is essential to good health.

The development of society can () the mass sports.

One way to do this is to encourage more () in sports activities.

下列酸性最强的是()

A. 甲酸
B. 乙酸
C. 苯甲酸
D. 苯乙酸