题目

---- It took me nearly 5 years to make a breakthrough in my field.    ---- Well, you know what people say. _________. A. There is no smoke without fire.    B. Practice makes perfect. C. All roads lead to Rome.           D. No pains, no gains. 答案：D（07年东城区一模理）（13分）       已知函数   （I）求的最小正周期；   （II）求函数图象的对称轴方程；   （III）求的单调区间.