单项选择题

The best title of the passage is ______.

A．The Methods of Science
B．How to Make Deductions
C．The Air Pressure Hypothesis
D．How to Form a Hypothesis
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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
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.
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