题目内容

Java中文件字节输入流FileInputStream类使用（）方法读文件内容。

A. read()
B. write()
C. close()
D. flush()

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Java中文件字节输出流FileOutputStream类使用（）方法向文件写入内容。

A. read()
B. write()
C. close()
D. flush()

字节输入流的父类是（），字节输出流的父类是（）。字符输入流的父类是（），字符输出流的父类是（）。

Questions 19 to 21 are based on the passage you have just heard.According to the passage, how long have dogs been of assistance to humans?

A. For 100 years.
B. For hundreds of years.
C. For less than 100 years.
D. For 1,000 years.

Where can you find proof that dogs have been helping humans for many years?

A. Wood carvings.
B. Scrolls.
C. Wall paintings.
D. All of the above.