单项选择题

She claims to be very learned in biochemistry, but in fact ______ she knows about it is all sadly out of date.

A. so little
B. that much
C. what little
D. how much
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单项选择题
Scientists generally hold that language has been so long in use that the length of time writing is known to cover is ______in Comparison.
A．overwhelming
B．uninspiring
C．astounding
D．trifling
单项选择题
Crew chiefs supervised engines, switches and lights that told them how each item of equipment was functioning（）

A. observed
B. preserved
C. monitored
D. nurtured
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