题目

Unemployment in USA is likely to remain high in 2011, and _______ for the next few years. A. possibly       B. necessarily               C. gradually          D. normally   答案：A小刚用水平推力推水平地面上的讲桌，结果没有推动，下列说法正确的是（ ）A. 讲桌不受摩擦力B. 推力与讲桌的重力大小相等C. 推力小于地面对讲桌的摩擦力D. 推力与地面对讲桌的摩擦力大小相等