单项选择题

Now that in scientific communities the use of computers is widespread, and supposing that there is sufficient time, there exist no complicated problem ______ can be addressed with some hope of resolution.

A．and
B．but
C．as
D．which
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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
单项选择题
Mr. Bridges mentioned briefly several other subjects in the course of his talk but mostly kept himself to the main topic.
A．touched off
B．touched down
C．touched on
D．touched up
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