Children in that kindergarten are sometimes asked to sit on their hands            ______listening to the teacher.

A．while

B．though

C．after

D．during

发动机前置前轮驱动，具有结构紧凑减小轿车质量、降低地板高度、改善高速行驶时的操纵稳定性等（）。

A、特点

B、优点

C、性能