单项选择题

Why does the author mention doorbell rings

A．It is a type of information.
B．It is a type of break.
C．It is a type of incentive.
D．It is a type of warnin
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单项选择题
The U. S. Constitution requires that the president should be a ______ -year-old native born American citizen, living in the States for 14 years.
A．25
B．35
C．45
D．40
单项选择题
In English Civil War, also called the Puritan Revolution, a famous general ______ defeated the king at Naseby in 1645.
A．Cromwell
B．Montford
C．Robert
D．Richard
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