单项选择题

A．Fifty dollars.
B．Five dollars.
C．Two hundred dollars.
D．Seventy-five dollars.
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单项选择题
A．He still can’t write well.B．He can write very good English now.C．He finds it easy to write now.D．He can write better now.
A．He still can’t write well.
B．He can write very good English now.
C．He finds it easy to write now.
D．He can write better now.
单项选择题
A．Use experimental data only.B．Ask people’s opinions on various matters.C．Use statistical data based on scientific models.D．Observe people in real-life situations.
A．Use experimental data only.
B．Ask people’s opinions on various matters.
C．Use statistical data based on scientific models.
D．Observe people in real-life situations.
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