A:(a2)3=a5
B:(ab)2=ab2
C:a6÷a3=a2
D:a2•a3=a5
聚精会神____ 兴高采烈____ 耐心____
关于世界语言的叙述正确的有( )
老年人“耳背”,只有大声说话,才能勉强听清楚;其病变部位可能是( )
-- Hello, Tim! What's that?-- It's eraser.