单项选择题

People think that the pure scientist usually disregards the application of pure science to practical affairs, ________ his attention to explanation of how and why events occur.

A．refining
B．defining
C．confining
D．declining
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单项选择题
Without air resistance, all objects would fall at the same speed ________ their weight.
A．regardless of
B．instead of
C．according
D．despite of
单项选择题
We cannot expect him to continue these activities under such unfavorable ________.
A．environments
B．circumstances
C．surrounding
D．situations
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