单项选择题

The birchbark canoe is not as ______ as it appears; it is built to withstand long journeys over rough waters.

A．solid
B．fragile
C．tough
D．sturdy
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A．whichB．whyC．thatD．for
A．which
B．why
C．that
D．for
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A．aB．veryC．theD．most
A．a
B．very
C．the
D．most
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