如果a<0,b>0,那么ab( )0。
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下列地形区中,位于我国第三阶梯的是[ ]
A.长江中下游平原
B.东南丘陵
C.黄土高原
D.四川盆地
He ____________up early since his childhood.
A.used to get
B.is used to getting
C.has been used to get
D.has been used to getting