如图6-4-4所示,在光滑的水平面上,木块A以速度v向右运动,已知A、B两木块质量相等.当木块开始接触固定在B左侧的弹簧C后(    )

图6-4-4

A.当弹簧C压缩量最大时,木块A减少的动能最多

B.当弹簧C压缩量最大时,木块A减少的动量最多

C.当弹簧C压缩量最大时,整个系统减少的动量最多

D.当弹簧C压缩量最大时,A、B两木块的速度相等

– Why does Mary look so sad?

– Maybe the things _______ she saw made her think of her grandmother.

A．that

B．what

C．who

D．Whom