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 advocates of nature urged more green coverage on __________ lots.
A．vain
B．valid
C．vacant
D．vague
单项选择题
What can be inferred from the sentence Almost immediately it was clear that the primary mirror was misshapen—not to the extreme but enough to pull some lace curtains across Hubble's 'window on the universe'
A．There were some serious flaws in Hubble so that it couldn't work.
B．The mistake in the primary mirror led to incorrect views of the universe.
C．Hubble's mirror was rendered vague due to the lace curtains.
D．With some lace curtains, Hubble is like a window on the universe.
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