单项选择题

Questions 19 to 21 are based on the conversation you have just heard.

A．Three packages.
B．Five packages.
C．Seven packages.
D．Nine packages.
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填空题
In Britain, there are 4.3 million closed-circuit television cameras, which are used to ______.
单项选择题
A．More than 20 million.B．More than 1 billion.C．More than 80 million.D．More than 3 billion.
A．More than 20 million.
B．More than 1 billion.
C．More than 80 million.
D．More than 3 billion.
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