苫盖篷布的车辆，篷布苫盖不得遮盖车号和货车表示牌。
参考答案：对
—Hello! Could I speak to Mr. Liu, please?
—Sorry. He ___________ Sanya for a holiday.
A. has gone to B. has been to C. went
如果圆的半径扩大到原来的3倍，那么它的面积就扩大到原来的[ ]
A.3倍
B.6倍
C.9倍
