单项选择题

According to the science of aerodynamics,the shape of an object influences the amount of drag created by air flowing around it.

A．form
B．size
C．weight
D．interior
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单项选择题
One of the newer conservation projects undertaken by the state of Oklahoma involves flood prevention.
A．topics
B．programs
C．concerns
D．schools
单项选择题
In 1845 Sarah Mather invented a submarine telescope that could be used to locate and study underwater objects.
A．illuminate
B．raise
C．find
D．examine
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