如图，以O为圆心，半径为2的圆与反比例函数y=$\frac{\sqrt{3}}{x}$（x＞0）的图象交于A、B两点，则$\stackrel{\wedge }{AB}$的长度为（　　）

下列有关动物生殖发育的叙述中，错误的是（  ）

在$△ABC$中，内角A,B,C所对的边分别为a,b,c，其中$A={120}^{\circ },b=1$，且$△ABC$面积为$\sqrt{3}$,则$\frac{a+b}{\sin A+\sin B}=$(      )

Lisa: Hi, Mandy. What are you doing right now?

Mandy: I'm getting ready to bring Willy to his computer class.____

Lisa: Why is your son in so many different classes.

Mandy:____

Lisa: But does he like all those classes?

Mandy: He is too young to know what he likes____

Lisa:____ Around 3:00.

Mandy: Sorry, I don't. Willy's class ends at 3:00. And I promised him that I would take him swimming.

Lisa:____

Mandy: No, I won't. I'll be there on time.

把下面的词语整理成句子，并加上标点。