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

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.

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.