单项选择题

You have to be ______ when you try to work out mathematical formulas.

A．reasonable
B．rational
C．logical
D．sound
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Ifs no good ______ him. He is always indifferent towards other's matters.
A．to turn to
B．turning to
C．turn to
D．turned to
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Try ______ the green button to see if the machine will start.
A．press
B．to press
C．pressing
D．to have pressed
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