She often skips _____________ her skipping rope. [ ]
A. and
B. use
C. with
答案：C
把376-48÷2×3的运算顺序改为先算差，最后求积，则原式变为______．
《西部大开发“十一五”规划》中明确的国家石油储备基地布点于( )。
A．新疆 B．甘肃 C．云南 D．四川
