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
ADULTERATE: PURE
A．outstanding: excellent
B．embellish: austere
C．mosquito: blood
D．concentrate: part
单项选择题
MATRIX: NUMBERS
A．gas: molecules
B．insurance: securities
C．crystal: atoms
D．base: athletics
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