单项选择题

The common aspect for the journal articles, theses and conference papers lies in that ______.

A．they are all for the practitioners
B．they are all to be read by researchers
C．they are all for being published
D．they are all forms of reporting research

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单项选择题

We can distinguish those research reports from each other mainly through ______.

A．their writing style and length
B．their aims and possible audiences
C．their presented places and time
D．their content and purposes

单项选择题

The best title for this passage could be ______.

A．Types of Research Reports
B．Types of Journal Articles
C．Writing of research Reports
D．Writing of Different Articles