根据句意和首字母写单词。

1. New Year is a traditional f_________ for Chinese people.

2. There are t_________ months in a year.

3. She often borrows books from the school l_________.

4. It is very h_________ in summer.

5. He was late for class because he m_________ the first bus.

水体的硬度取决于

A．水中碳酸盐的含量

B．水中硫酸盐的含量

C．水中钙、镁离子的含量

D．水中钙、镁盐类的总含量

E．水中氯化钙的含量