问题
选择题
______ trees were cut down. And many birds lost their home.
A. Two thousands B. Thousand of C. Thousands of
答案
答案：C
题目分析：句意：成千上万棵树被砍伐。许多鸟类失去了他们的家。在表示确切数字时，thousand不用复数，也不与of连用，但表示概数时，thousand必须使用复数形式，并且与of连用。所以选C。