题目内容

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

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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

化学固定

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