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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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

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.