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A School Bag Lost
......

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单项选择题
The author seems to compare the toll booths to
A．profit opportunities.
B．the market.
C．the investors.
D．profit.
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Which might be the most appropriate title of the passage
A．At the Threshold of Neutrino Astronomy.
B．Neutrinos and the History of the Universe.
C．The Creation and the Study of Neutrinos.
D．The DUMAND System and How It Works.
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