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.
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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
单项选择题
Why does the author mention planktonburgers in (L. 3, Par
A．4)A. To describe the appearance of one type of plankton as a food source and then moves to a specific example.B. To illustrate how much plankton a whale consumes.C. To suggest plankton as a possible food source.D. To compare the food values of heel and plankton.
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