单选题
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
【正确答案】
B
【答案解析】
原文是These formats differ from one another mostly in their purposes and the audiences which they address．本题题干中换用了另一种表达方式。
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