单项选择题

A．They are microscopic.
B．They move very quickly.
C．They are transparent.
D．They are rarely found near the surface.
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单项选择题
A．Oceanic snails,B．Large green jellyfish.C．Different planktonic plants.D．Sunken treasure chests.
A．Oceanic snails,
B．Large green jellyfish.
C．Different planktonic plants.
D．Sunken treasure chests.
单项选择题
A．Biology.B．Photography.C．Swimming.D．Painting.
A．Biology.
B．Photography.
C．Swimming.
D．Painting.
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