单项选择题

A．She’’d like to have the windows open.
B．She likes to have the air conditioner on.
C．The air is heavily polluted.
D．The windows are already open.
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单项选择题
According to the author, three design types of previous researches are________.
A．interrelated t6 one another
B．supplementary to one another
C．to be modified considerably
D．to be integrated into one design
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