若m>n,下列不等式不一定成立的是( )
A:m+2>n+2
B:2m>2n
C:m2>n2
D:m2>n2
- Is he your ____ (brother/sister)?
- Yes. He's my brother. He's ____ (young/old).
我国香港和新加坡旅游业发达的条件是( )
下列人物的情绪表现中,属于积极情绪表现的是( )