单项选择题

有些金藻种类的大量繁殖可形成赤潮、水华，给渔业带来危害。

A．对
B．错

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单项选择题

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单项选择题

A （）letter is written to congratulate a business associate on his or her achievement. This letter conveys your best wishes to the person who has achieved something.
A、birthday congratulation
B、new year's congratulation
C、newlyweds congratulation
D、business congratulation