下列运算结果正确的是( )
A:a+2b=3ab
B:3a2﹣2a2=1
C:a2•a4=a8
D:(﹣a2b)3÷(a3b)2=﹣b
⑴____hair hear
⑵____there where
⑶____chair here
⑷____pear bear