Gaokao Math Practice Question
已知直三棱柱 $A B C-A_{1} B_{1} C_{1}$ 中, $\angle A B C=120^{\circ}, A B=2, B C=C C_{1}=1$, 则 异面直线 $A B_{1}$ 与 $B C_{1}$ 所成角的余弦值为 ($\qquad$)
- A.$\frac{\sqrt{3}}{2}$
- B.$\frac{\sqrt{15}}{5}$
- C.$\frac{\sqrt{10}}{5}$
- D.$\frac{\sqrt{3}}{3}$
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