下列四个函数中，以π为最小周期，且在区间（
|
在A中，y=sin2x的最小正周期是π，
在区间（
，π）上先减后增；π 2
在B中，y=2|cosx|的最小周期是π，
在区间（
，π）上为增函数；π 2
在C中，y=cos
的最小正周期是4π，x 2
在区间（
，π）上为减函数；π 2
在D中，y=tan（-x）的最小正周期是π，
在区间（
，π）上为减函数．π 2
故选D．
According to the passage, which of the following is true
A．Not all restaurant owners agree to pass the new anti-smoking law.
B．Not all restaurant owners want to call the police when there are people smoking at their places.
C．Restaurant owners believe the police have a grudge against them.
D．Only restaurant owners will be fined should any of their clients smoke at their places.