题目

—Is that a pencil?— . It's a pen. A . Yes, it is B . No, it isn't C . No, that isn't D . Yes, that is 答案：B10．已知椭圆C：$\frac{{x}^{2}}{4}$+$\frac{{y}^{2}}{3}$=1，直线l：y=k（x+3），（1）若直线l与C有两个不同的公共点，求实数k的取值范围；（2）当k=$\frac{1}{2}$时，直线l截椭圆C的弦长．