单项选择题

A．This is an international conference.
B．This is an academic conference.
C．This is a formal occasion.
D．The language used in this conversation is informal.
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单项选择题
A．He is a Chinese scientist.B．He experienced several setbacks in study in the past decade.C．He as well as his Chinese colleagues has made many breakthroughs in the last decade.D．He is going to express his hearty thanks for the international aids he has received in the past decade.
A．He is a Chinese scientist.
B．He experienced several setbacks in study in the past decade.
C．He as well as his Chinese colleagues has made many breakthroughs in the last decade.
D．He is going to express his hearty thanks for the international aids he has received in the past decade.
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