中国民歌的主要形式有（）三大类。
参考答案：劳动号子、山歌、小调
The big snow caused great ________ to the people living in the south of China, ________ some of them homeless.
A．destroy; left
B．damage; leaving
C．ruin; having left
D．wound; leaving
沉井超沉的原因是什么？
