单项选择题

Questions 11 to 18 are based on the conversation you have just heard.

A．In an office.
B．In a hotel.
C．At a dinner table.
D．At the man’ s house.
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单项选择题
According to the passage, Benjamin Franklin was the first to prove that______.
A．lightning is caused by hail through supercooled clouds
B．thunderclouds are not charged with electricity
C．thunderclouds are charged with electricity
D．lightning was not an invention of the devil
单项选择题
This passage is about a______.
A．law
B．hypothesis
C．guess
D．theory
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