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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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
单项选择题
According to the passage, if we go on increasing the population, we will face （）.

A．a food shortage
B．a crisis
C．an overpopulation
D．a starvation
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