已知双曲线 x2a2−y2b2=1(a，b>0) 的离心率为 5 ，则抛物线x2=4y的焦点到双曲线的渐近线的距离是

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已知双曲线

x

2

a

2

−

y

2

b

2

=1(a，b>0) 的离心率为 5 ，则抛物线x²=4y的焦点到双曲线的渐近线的距离是（）

A： $\frac{\sqrt{5}}{10}$

B： $\frac{\sqrt{5}}{5}$

C： $\frac{2 \sqrt{5}}{5}$

D： $\frac{4 \sqrt{5}}{5}$

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B

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Uncle Lee is coming to have dinner with us. Mom and I go shopping. We don't have any meat. We need to buy some. It's ten yuan a kilo before. But now two kilos are sixty yuan. I say, "Mom, let's buy some fish." Mom answers, "OK." Fish is Uncle Lee's favorite food. We buy one kilo and a half. We also buy some vegetables and some chicken, but we don't buy any hamburgers. Uncle Lee doesn't like them at all. Mom also wants to buy some apples for me. You know, I like bananas, oranges and peaches, but I like apples best. But we can't find any. We go home at a quarter to five in the afternoon.

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