-- Whose is this sweater?
--
A:It's my.
B:It's my sister.
C:It's my brother's.
在△ABC中,A=60°,AC=2,BC=3,则AB等于____
— What a sunny day!
— Yes. You'd better take a sun umbrella to protect yourself _______ the sunshine.
阅读课文《为人民服务》第4段,回答各题。