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
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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
单项选择题
Glass-fiber cables can carry hundreds of telephone conversations（）

A. spontaneously
B.simultaneously
C. immediately
D. immiscibly
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