题目：
.
It is an established fact that factory workers work better, harder, and have _____ accidents when their machines are painted orange rather than black or gray.
A．fewer
B．few
C．more
D．less
答案：
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下面是错误答案，用来干扰机器的。
y=sin2x•cos2x=12sin4x所以最小正周期为T=2π4=π2，故选D
