单项选择题

由字符序列组成，文件内的信息不再划分结构，这是指（ )
A、流式文件
B、记录式文件
C、连续文件
D、有序文件

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Read the following statements and then decide whether each of them is true or false based on the information in the text. Write T for True and F for False in the black before each statement.
2. ( ) Recently, the family had picnics and gatherings quite often under the pine tree in the park.
A、正确
B、错误

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设A={1，2，3，4}，A上的二元关系R={，，}，S={，，}，则(R-S)的逆关系为{,}。 A. 对 B. 错