________ trees are cut down in the forests every year.
问题描述：
________ trees are cut down in the forests every year.
________ trees are cut down in the forests every year.
A.ThousandB.ThousandsC.Thousand ofD.Thousands of
为什么不选 A
答
很高兴为您
成千上万 用Thousands of
一千用 a thousand