单项选择题

A．superior
B．inferior
C．added
D．equal
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单项选择题
How much did the sales of all makes of desktop machines drop in the third quarter
A．46.8 percent
B．43.8 percent
C．53.8 percent
D．56.8 percent
单项选择题
Polarized light is a probably phenomenon characterized by its ______.
A．rotational symmetry.
B．charged particles.
C．radiation flashes.
D．frequent twists.
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