关于胆囊结石，下列描述不正确的是（）
A．均为强回声团
B．随体位移动
C．后方伴声影
D．胆囊窝处弧形强回声带
E．可伴有胆泥回声
参考答案：D
A clean environment can help the city bid for the Olympics, which ____ will promote its economic
development. [ ]
A. in nature
B. in return
C. in turn
D. in fact
液动震击器
