md作用为：（）。Ren作用为（）。type作用为：（）。
参考答案：创建目录；改文件名；查看文本文件内容
一旦发生火灾，应根据具体情况选用（）灭火器进行灭火并报警。
A、适当的
B、最好的
C、泡沫式
D、干粉
What is said about the research paper
A．The paper came out as short as I expected.
B．Actually the paper was long enough to cover it.
C．The paper was short enough to present.
D．The paper turned out better than I had expected.
