题目

—There is no need ______,for the clock says we have about ten minutes to go. —Oh,don’t be foolish.The clock on the wall is five minutes______,don’t you know? A.to rush;later                             B.to worry;later C.worrying;lately                        D.to rush late 答案:D 解析: 考查不定式的用法。There’s no need to do sth.是固定结构,意思是“没有必要干某事”,晚点5分钟要用late,不能用比较级形式。 A.(不等式选讲) 不等式|x-1|+|x+3|>a,对一切实数x都成立,则实数a的取值范围为________.B.(几何证明选讲)如图,P是圆O外一点,过P引圆O的两条割线PAB、PCD,,CD=3,则PC=________.C.(极坐标系与参数方程)极坐标方程ρsin2θ-2•cosθ=0表示的直角坐标方程是________.
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