单项选择题

When you hear two shouts or two whistles, you know that ______.

A．people will come to help you
B．someone needs help
C．something terrible will happen
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单项选择题
A．heardB．listened toC．found
A．heard
B．listened to
C．found
单项选择题
At last Jack took the visitor's cap in his mouth.
A．Right.
B．Wrong.
C．Doesn't say.
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