trees were cut down. And many birds lost their home.A. Two thousandsB. Thousand of C. Tho

问题补充：

trees were cut down. And many birds lost their home.

A. Two thousandsB. Thousand of C. Thousands of

答案：

解析：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。