问题
单项选择题
The thief was apprehended, but his accomplice had disappeared.
A．people who saw him
B．the person who helped him
C．guns and knives
D．stolen goods
答案
参考答案：B
解析：名词辨析。accomplice同谋者，帮凶：The police arrested him and his two accomplices．警方逮捕了他和他的两个同谋。
绕x轴旋转而成，圆锥面∑Z是由过点(4，0)且与椭圆
相切的直线绕x轴旋转而成．