在R上定义运算，若不等式成立，则实数a的取值范围是( )．
We were ______. So we bought a watermelon. A. thirsty B. dirty C.angry
Drink ________ water or juice A. a lot B. lots of C.a lots of
Yesterday I _______ Grandma. A. phone B. phoned C.phones
Come _____ , please！ A. in B. of C.at
Maliang ____ a paintbrush.It was magic.A.have B.has C.had
，若不等式
成立，则实数a的取值范围是( )．
}
}
}
}
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