在文字编排上最整齐的编排方式是（）的方式.
A.左边对齐
B.齐头齐尾
C.对齐中间
D.齐头不齐尾
参考答案：B
—Are they working near the house?
—_____. [ ]
A. Yes, there are
B. No, there isn't
C. No, there aren't
D. Yes, they are
在人体中，脑、肝、肾、血液、软组织的声（）
A.是1500m/s
B.是3360m/s
C.约为1500m/s
D.约为3360m/s
E.约为4360m/s
