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【单选题】
What is the main purpose of the lecture?A.
To compare the study of world history to the study of United States history
B.
To explain to the students their next assignment
C.
To explain different approaches to the study of world history
D.
To explain the origins of history as an academic discipline
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【简答题】We must keep our classroom cleanly.
【单选题】We must keep up with the development of the worlds leading enterprises ______we can keep pace with the changing of the international situations.
A.
before
B.
unless
C.
once
D.
until
【单选题】We must keep on learning if we want to keep up with the of the changing times.
A.
schedule
B.
journey
C.
pace
D.
transport
【简答题】柴油机燃料供给系主要有几部分组成?各部分的功用是什么?
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