题目内容

在Linux系统中,默认的输入输出设备分别是键盘和屏幕,利用操作符可以重新定义默认的输入和输出设备对象。

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“<”“<<”称为重定向操作符。

管道是由符号“|”隔开的若干命令组成的序列。

A. 对
B. 错

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.

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