单项选择题


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

A．The trans former.
B．The battery.
C．The fuses.
D．The wires.
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单项选择题
A．It reflects commercial interests~B．It is a fashionable professional event.C．It is an essential affair for international cinema.D．It is more concerned with the art of film than with financial interests.
A．It reflects commercial interests~
B．It is a fashionable professional event.
C．It is an essential affair for international cinema.
D．It is more concerned with the art of film than with financial interests.
填空题
The main sources of influenza viruses in lake water are ______, which may stay infectious for up to 30 days.
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