管道操作符的作用就是实现将前一个命令输出的数据结果作为后一条命令所需要的数据源参数。
A. 对
B. 错
Why is Simon calling Judy?
A. He wants to know what Judy is busy with.
B. He wants to make sure that Judy really can’t come to his party.
C. He wants to know why Judy can’t come to the party.
D. He wants to persuade Judy to come to his party.
Why can’t Judy go to Sam’s party?
A. She has some work to do at home.
B. She has to write a paper.
C. She has to go to a teachers’ meeting at school.
D. She has to meet her students’ parents.
How long will the meeting probably last?
About 2 hours.
B. Well over 2 hours.
C. A little over 4 hours.
D. Over 3 hours.
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