单项选择题

During the 1990s world oil production will approach geological estimates of maximum production______, even with rapidly increasing petroleum prices.

A．capability
B．quota
C．potentiality
D．capacity
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Both men and women, nine times out of ten, are firmly______ of the superior excellence of their own performance.
A．asserted
B．ensured
C．convinced
D．conceived
单项选择题
The two astronauts______ someday hope it is to fly the craft into earth orbit were fight testing.
A．that
B．whom
C．whose
D．who
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