题干
Tom sits _____ Jim and me.
A：among
B：between
C：on
D：in
答案(点此获取答案解析）
C
Tom sits _____ Jim and me.
A：among
B：between
C：on
D：in
径为3的⊙O内，OA=，P为⊙O上一点，当∠OPA取最大值时，PA的长等于（ ）.
