题目

如图所示，质量均为m的两木块A与B叠放在水平面上，A受到斜向上与水平方向成θ角的力的作用，B受到斜向下与水平方向成θ角的力的作用.两力大小均为F，两木块保持静止状态.则： ①A、B之间一定存在静摩擦力  ②B与地之间一定存在静摩擦力  ③B对A的支持力一定小于mg  ④地对B的支持力一定大于2mg 以上叙述正确的是（    ） A.①②        B.③④        C.①③        D.②④—Would you like to watch the film Batman v Superman with me tonight? —I still want to see it again although I it two weeks ago. A. have watched B. was watching C. watched D. watch