问题
选择题
He speaks very good English but he knows _______ English people. [ ]
A. few
B. little
C. a few
D. a little
答案
答案：A
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He speaks very good English but he knows _______ English people. [ ]
A. few
B. little
C. a few
D. a little
答案：A
假定要在一台处理机上执行下列作业：
| 作业 | 执行时间 | 优先级 |
| 1 | 10 | 3 |
| 2 | 1 | 1 |
| 3 | 2 | 3 |
| 4 | 1 | 4 |
| 5 | 5 | 2 |