单项选择题

SOUND: ECHO ::（）

A．sight: rainbow
B．episode: television
C．light: reflection
D．affection: attachment
E． observation: microscope

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单项选择题
Though （） in his youth, Muir grew in the fullness of time to acquire truly （）habits envied by even the most hardened of his fellow survivalists.

A．a stoic ... gourmet
B．a sycophant ... humble
C．an eccentric ... practical
D．a sensualist ... spartan
E．an ideologue ... catholic
单项选择题
Despite certain （）habits of the North American screech owl, it performs the majority of its hunting alone, in alpine forests, unfettered by （）

A．predatory... ecology
B．instinctual ... behavior
C．exogamous... kinship
D．omnivorous... diet
E．diurnal... darkness
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