下列计算中正确的是[ ]

A.4x²y⁵÷xy=xy⁴

B. (12m³+8m²⁴m) ÷(2m)= 6m²+4m²

C.(2a+b)⁴÷(2a+b)²=(2a+b)²=4a²+b²

D. (3xⁿ)³÷(2xⁿ)² ×(4x²)²=108xⁿ⁺⁴

I’ve bought an English dictionary which you can ____ if you meet new words.

A get to         B come to          C refer to       D look up