单项选择题

ECHO: SOUND

A．reflection: light
B．microphone: hearing
C．conservation: talk
D．implication: tone
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单项选择题
PERPLEXED: CLARIFICATION
A．relaxed: recreation
B．learned: profession
C．anxious: reassurance
D．upset: confidence
单项选择题
CLAY: PORCELAIN
A．flax: linen
B．sand: sediment
C．computer: program
D．soup: luncheon
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