单项选择题

Engineers use the principles of aerodynamics in designing airplanes and other objects affected by aerodynamic forces.

A．laws
B．movements
C．studies
D．products
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单项选择题
National forests make money for the government through the sale of trees for lumber.
A．earn
B．print
C．trade
D．borrow
单项选择题
The Social Insurance Number(SIN) card is the primary mode of identification for Canadians.
A．principal
B．original
C．prior
D．sole
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