单项选择题

From the passage we know that ______.

A．it was Galileo that formed the hypothesis of air pressure
B．Torricelli was confused by the problem of the water-pump
C．Pascal's experiment further proved the air-pressure hypothesis
D．the weight of mercury column influenced air pressure
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单项选择题
According to the passage, which of the following is not true
A．Galileo did not solve the problem of the water-pump.
B．When a scientist tries to establish a scientific law, he must collect much information.
C．An original hypothesis is not always accepted.
D．Using a good vacuum pump, it is possible to raise water from the bottom of a building to the roof 50 feet above.
单项选择题
Why does the author mention the discovery of air pressure
A．To show that air behaves like water in some aspects.
B．To illustrate the special sequence of procedures involved in the establishment of the working laws of science.
C．To indicate that it was difficult to use scientific methods to solve the problem of vacuum pump.
D．To show how scientists make experiments to test their deductions.
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