《现代化的陷阱》是谁的著作？（）
A.何清涟
B.吴敬琏
C.薛兆丰
D.陈志武
参考答案：A
正常支气管动脉开口多位于胸主动脉相当于（ ）平面。通常有（ ）支，管径约（ ）mm。
The policemen had no ______ in finding the knife that the murderer had thrown.
A．difficulty
B．troubles
C．problems
D．question
