问题
单项选择题
若干进程之间相互合作，共同完成一项任务，进程的这种协同工作关系称为( )。
A．异步
B．同步
C．并发
D．互斥
答案
参考答案：B
解析： 进程同步是指进程之间一种直接的协同工作关系，这些进程相互合作，共同完成一项任务。进程间的直接相互作用构成进程的同步。
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若干进程之间相互合作，共同完成一项任务，进程的这种协同工作关系称为( )。
A．异步
B．同步
C．并发
D．互斥
参考答案：B
解析： 进程同步是指进程之间一种直接的协同工作关系，这些进程相互合作，共同完成一项任务。进程间的直接相互作用构成进程的同步。
第二节 完形填空（共20小题；每小题1.5分，满分30分） From the time each of my children started school, I packed their lunches. And in each lunch, I 1 a note. Often written on a napkin, it might be a thank-you for a 2 moment, a reminder of something we were happily expecting , or a bit of 3 for the coming test or sporting event. In early grade school they 4 their notes. But as children grow older they become self-conscious( 有自我意识的 )，and 5 he reached high school , my older son, Marc informed me he no longer 6 my daily notes. Telling him that he no longer needed to 7 them but I still needed to write them. I 8 until the day he graduated. Six years after high school graduation , Marc called and asked if he could move 9 for a couple of months. He had spent those years well, graduating from college , 10 two internships ( 实习 ) in Washington, D.C. , and 11 , becoming a technical assistant in Sacramento.12 short vacation visits, however, he had lived away from home . With his younger sister leaving for college , I was 13 happy to have Marc back . Since I was 14 making lunch for his younger brother , I 15 one for Marc , too. Imagine my 16 when I got a call from my 24-year-old son, 17 his lunch. “Did I do something 18 ?” Don’t you love me 19 , Mom ?” were just a few of the questions he threw at me as I 20 asked him what was wrong. “My note, Mom .” he answered . “ Where’s my note?”
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