题目内容

抗氧化剂要尽早加入。( )

A. 对
B. 错

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When can tourists enjoy the lavender best ?

A. In March and April
B. In May and June
C. In July and August
D. In September and October

Provence is the most popular region in France for tourists and holidaymakers, because___.

A. it has a great seaside.
B. it has a great natural environment.
C. it has a great cultrual heritage.
D. It has all of the above.

无机磷的解吸

有机磷的矿化

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