He is not very good at getting his ideas ________, so he is easily misunderstood by others.( ) A. over B. along C. across D. about 答案:C (2013?平凉)一些民间谚语常蕴含着丰富的物理知识,下面四句谚语中对应的物理知识正确的是( )A.潭清疑水浅--光的反射现象B.一个巴掌拍不响--声音不能在固体中传播C.人多力量大--杠杆原理D.磨刀不误砍柴工--减小受力面积,增大压强