一、单项选择(10分)
从A、B、C、D四个选项中，选择一个能填入句中空白处的最佳答案。
( )1. My brother has got ______ apple and ______ orange.
A. a; a B. a; an
C. an; an D. an, a
( )2. Eating fruit is good ______ us.
A. for B. with
C. at D. to
( )3. —Can you tell me how to ______ healthy?
— First, you should do morning exercises (早操).
A. buy B. close
C. play D. stay
