单项选择题

A．She assigned people to do this report.
B．She made investigations in the 700 schools.
C．She supported the report.
D．She wrote this report.
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单项选择题
A．He didn’t think it a success.B．He was listening too attentively to the speakers.C．He was puzzled by what the speakers said.D．He had nothing to say.
A．He didn’t think it a success.
B．He was listening too attentively to the speakers.
C．He was puzzled by what the speakers said.
D．He had nothing to say.
填空题
According to researchers, what factor or factors affect cognitive aging
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