单项选择题

Teachers recommend parents______their children under 12 to ride bicycles to school for safety.

A．not allow
B．do not allow
C．mustn’t allow
D．couldn’t allow
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单项选择题
Scientists study______human brains work to make computers.
A．when
B．how
C．that
D．whether
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
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