单项选择题

Which of the following statements best describes the organization of the passage

A．The author presents the advantages and disadvantages of plankton as a food source step by step.
B．The author quotes public opinion to support the argument for fanning plankton and concludes a summary.
C．The author classifies the different food sources according to the amount of carbohydrate.
D．The author makes a general statement about plankton and then gives examples.
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单项选择题
Why does the author mention planktonburgers in (L. 3, Para. 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.
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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