根据句意和空缺处所给首字母写单词。

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.

分时系统的特点最完整的描述是（）。

A.交互性、及时性和独占性

B.脱机性、高效性和独占性

C.交互性、及时性、同时性、独占性

D.交互性、及时性、同时性、系统高可靠性