单项选择题

Scientists study______human brains work to make computers.

A．when
B．how
C．that
D．whether
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单项选择题
The song Take Me Home, Country Roads has much______to people, for few people can avoid getting caught up in its originally real country music.
A．appeal
B．access
C．potential
D．devotion
单项选择题
Only when he reached the tea-house______it was the same place he’d been in last year.
A．he realized
B．he did realize
C．realized he
D．did he realize
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