题目

Many schools provide free lessons for students to play ________ football in the afternoon.A. the B. / C. a D. an 答案：【答案】B【解析】句意“一些学校在下午免费给学生提供踢足球的课程”。play football踢足球。球类运动前不加冠词，故选B。下列方程适合用因式方程解法解的是（ ）A．x2-3x+2=0B．2x2=x+4C．（x-1）（x+2）=70D．x2-11x-10=0