单项选择题

When a machine analyses the frequencies used by a particular voice and draws a graph of them, sound is ________electronically into a pattern of lines.

A．relieved
B．converted
C．magnified
D．burst
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单项选择题
A beautiful autumn day like this ________for the wet summer we have had.
A．compensates
B．revenges
C．balances
D．compels
单项选择题
The past decade has been the warmest for 1,000 years, according to a(n) ________of ice cores drilled from a glacier(冰川) in the Himalayas.
A．analogy
B．analysis
C．anniversary
D．appendix
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