夜间识别航标主要依据（）。
A.形状
B.灯质种类、周期
C.与海图进行比对
D.以上都对
参考答案：B
—When do you think ?
—I've no idea. [ ]
A. the train will arrive
B. will the train arrive
C. does the train arrive
D. the train does arrive
严肃剧
