单项选择题

The ozone layer plays as great a role in the stability of spaceship Earth as ______ the waters of its lakes, ponds, oceans, rivers, and streams.

A．do
B．does
C．play
D．are
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单项选择题
In that country, hospital doctors don't go sightseeing very often because their work ______ almost all their time.
A．takes up
B．takes off
C．takes apart
D．takes over
单项选择题
After a concert tour in Asia, Canada and the U. S. , he will ______. work on a five-language opera.
A．confine
B．indulge
C．resume
D．undergo
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