问题
填空题
已知函数f（x）=ex-2x+a有零点，则a的取值范围是___________。
答案
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已知函数f（x）=ex-2x+a有零点，则a的取值范围是___________。
| 选用正确的疑问词完称问句。 | |
— Twice a week. 2. — ____ will Tree Planting Day be? — In a week. 3. — ____ CDs have you got? — There are so many, I can't remember the number. 4. I can't say ____ I want to go back to my hometown. 5. — ____ has Miss Jones been in Beijing? — For two and a half years. |