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RED TIDES Different events can change the balance of sea ......

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单项选择题
They claimed that they did not arrange the demonstration. It was absolutely _______.
A．spontaneous
B．simultaneous
C．synthetic
D．substantial
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What is the main purpose of the research
A．To make preparations for a new publication.
B．To learn how couples spend their weekends.
C．To know how housework is shared.
D．To investigate what people do at the weekend.
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