单项选择题

A．It is the best city he’’s ever visited.
B．It was worse than he had expected.
C．It is difficult to get around in the city.
D．The hotel service is terrible in the city.
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单项选择题
The author mentions all of the following as reasons why plankton could be considered a human food source EXCEPT that it is ________.
A．high in food value
B．in abundant supply in the oceans
C．an appropriate food for other animals
D．free of chemicals and pollutants
填空题
A．confrontedB．commandedC．confinedD．committed
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