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【简答题】
单词填空。 1. The have planted about five ______ (千) trees in and around the town in the past few years. 2. I'd like eight ______ (条) of bread. 3. She will be the______ (第五十一个) to speak at the meeting. 4. He didn't go to bed ______ (直到) his father came back. 5. Where is your mother? She's ______ (准备) dinner in the kitchen. 6. Whose bag is this? It's one of my ______ (邻居). 7. There are two hundred______ (书架) in our school library. 8. Why don't you visit our______ (当地的) farms with us? 9. I hope we can have less _______(污染) in the environment in the future. 10.—How many students are there in the dining room now? — ______ (没有一个)
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【简答题】4个进程R1、R2、W1、W2共同使用缓冲区B，各自的功能是：R1从磁盘上读入数据存入B，供W1打印输出；R2从键盘上读入数据存入B，供W2打印输出。存入缓冲区B的数据在没有被打印前，不能再往B里存数；缓冲区B里的数据不能被重复打印。试用信号量上的P、V操作协调它们之间的关系，保证有条不紊地工作。