单项选择题

A．She was asked to lead a group of inexperienced cavers there.
B．It was the first cave that she had ever visited.
C．Clearly marked trails made it easy to explore.
D．She hoped to make a discovery.
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单项选择题
A．Training given to music therapists.B．How music prevents disease.C．Studies on the benefits, of music.D．How musicians create music.
A．Training given to music therapists.
B．How music prevents disease.
C．Studies on the benefits, of music.
D．How musicians create music.
单项选择题
They aim to ______ the maximum economic benefit from the Olympic Games.
A．contract
B．distract
C．extract
D．subtract
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