对于急性阑尾炎有诊断意义的辅助检查是（）
A.B超
B.钡灌肠
C.结肠镜
D.肠系造影
E.乙状结肠镜
参考答案：A
The traffic rule says young children under the age of four and________ less than 40 pounds must be in a child safety seat
A．being weighed
B．weighs
C．weighed
D．weighing
A类火灾——（）
