Gaokao Math Practice Question
若直线 $l$ 与曲线 $y=\sqrt{x}$ 和 $x^{2}+y^{2}=\frac{1}{5}$ 都相切, 则 $l$ 的方程为 ($\qquad$)
- A.$y=2 x+1$
- B.$y=2 x+\frac{1}{2}$
- C.$y=\frac{1}{2} x+1$
- D.$y=\frac{1}{2} x+\frac{1}{2}$
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