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【单选题】
设函数f（x）是定义在R上周期为2的可导函数，若f（2）=2，且 lim x→0 f(x+2)-2 2x =-2 ，则曲线y=f（x）在点（0，f（0）处切线方程是（ ）A.
y=-2x+2
B.
y=-4x+2
C.
y=4x+2
D.
y=- 1 2 x+2
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A.
to provide a production subsidy to the domestic firms.
B.
to impose an import tariff on cheeses produced in other countries.
C.
. to impose an import ban on cheeses produced in other countries.
D.
. to eliminate all barriers on cheese imports since no protectionist policy would be efficient.
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B.
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C.
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