A.增加端点P0/=2P0-P1，Pn/=2Pn-Pn-1
B.将原端点替换为P0/=2P0-P1，Pn/=2Pn-Pn-1
C.增加端点P0/=P0-2P1，Pn/=Pn-2Pn-1
D.将原端点替换为P0/=P0-2P1，Pn/=Pn-2Pn-1
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