著名油画《愚公移山》的作者是[ ]
A.张大千
B.齐白石
C.徐悲鸿
D.茅盾
答案:C
— What's wrong, Mary? You look sad.
— Oh, nothing much. In fact, I _____ of my English test. [ ]
A. think
B. was thinking
C. will thing
D. would think
在图中画出物体A所受重力的示意图和拉力F所对应的力臂l。