单项选择题

Without the friction between their feet and the ground, people would ________ be able to walk.

A．in no time
B．by all means
C．in no way
D．on any account
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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.
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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