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
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单项选择题
What is mentioned as one distinguishing feature of krill
A．They are the smallest marine animals.
B．They are pink in color.
C．They are similar in size to lobsters.
D．They have grass like bodies.
单项选择题
According to the passage, why is plankton considered to be more valuable than land grasses
A．It is easier to cultivate.
B．It produces move carbohydrates.
C．It does not require soil.
D．It is more palatable.
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