题目

 ——Mary is hard—working .She studies very hard.             ——Yeah. She ______ watches TV on school nights. A、often            B、usually C、always           D、hardly 答案:D如图,正方形ABCD内接于⊙O,E为DC的中点,直线BE交⊙O于点F,如果⊙O的半径为,则O点到BE的距离OM=( )A.B.C.D.
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