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
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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
单项选择题
The author mentions her own childhood experience to show that ______.
A．she never understood why her parents had odd jobs and argued about the president
B．she didn't know what her parents did to earn money to support the family when she was young
C．she did understand why the American became more and more close and hugged a lot
D．she could see that the American parents keep the stress and tiredness from work to themselves
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