单项选择题

A．able
B．failing
C．unable
D．incapable
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单项选择题
A．thenB．thereforeC．soD．otherwise
A．then
B．therefore
C．so
D．otherwise
填空题
For a fish to move through water, it must actually shove it aside. Most can do this by wiggling back and forth in snakelike motion.
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