题干
You'll have holiday next week. Where are you going?
A：a seven-day
B：seven-days
C：a seven day
D：a seven-days'
答案(点此获取答案解析）
A
上的点，且曲线C在点P处切线倾斜角的取值范围为
，则点P横坐标的取值范围为（ ）