单项选择题

Another example of a scientific model would be （）.

A．a map
B．a paper airplane
C．an atom
D．a light bulb

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问答题
你的朋友来信，询问你对“责任”一词的看法。回信阐述你的个人观点，结尾处指出，信中的观点仅为个人看法。
单项选择题
Which of the following would be the best title for the passage（）

A．Selling and Buying.
B．What is the Market
C．Everything you do Is producing for the market.
D．What the market can do for you
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