题目

I walked up to the top of the hill with my feiend, _____we enjoyed a splendid view of the lake A.which         B. where         C. who        D.that 答案：B  19．已知sin（α+$\frac{π}{3}$）=$\frac{1}{3}$，且α为三角形一内角，则cos（α+$\frac{π}{6}$）的值等于$\frac{-2\sqrt{6}+1}{6}$．