在△ABC中，AC＝$\sqrt{7}$，BC＝2，B＝60°，则BC边上的高等于(   )

A

Mikey：I will(将)meet some friends after breakfast．And I'll go to the supermarket (超市)after that．Do you need(需要) anything, Mom?

Mom：Oh, yes please．We need some chicken for lunch．

Mikey：OK. What about fruit?

Mom：I want some bananas, strawberries, and pears．We can have fruit salad for dinner． Oh, can you get four tomatoes and two carrots too?

Mikey：Sure. I'll buy some chicken, fruit, tomatoes and carrots．Any bread or milk?

Mom：No, we have much．Oh, we don't have eggs．

Mikey：OK．I'll buy some．

Morn：Thank you, Mikey．You can buy ice-cream for yourself．

Mikey：That's great! I like it．

Mom：Let's have breakfast first．

Mikey：OK．

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