题目

He ______ his paper to see if there are any obvious mistakes. A. looked into        B. looked up          C. looked around           D. looked through 答案：D某同学在上体育课时，用力推出一个铅球，铅球在空中运动时，下列说法正确的是A.受到手的推力和重力B.只受到手的推力，方向向前C.只受重力，方向竖直向下D.不受任何力的作用