单项选择题

As our plane __________ to the height of 10,000 feet, we felt the breathing difficulty instantly.

A．descended
B．ascended
C．transcended
D．dropped
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单项选择题
The fossil fuel would be __________ within half a century if we made no immediate actions now.
A．exhausted
B．extracted
C．exhibited
D．extinguished
单项选择题
As the factory locates in the mountains of rich resources, it provides the neighboring with __________ metal products.
A．identical
B．equal
C．diverse
D．uniform
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