题目

如图点P为弦AB上一点,连接OP,过P作PC⊥OP,PC交⊙O于点C,若AP=4,PB=2,则PC的长为() A . B . C . D . 答案:C18、Look at the flowers! They are in different _______: red, yellow, pink… A.colors        B.sizes        C.prices        D.names
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