单项选择题

Although the new library service has been very successful, its future is______certain.

A．at any rate
B．by no means
C．by all means
D．at any cost
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单项选择题
These two chemicals______with each other at a certain temperature to produce a substance which could cause an explosion.

A．interact
B．attract
C．react
D．expel
单项选择题
______they can get people in the organization to do what must be done, they will not succeed.
A．Since
B．Unless
C．If
D．Whether
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