单项选择题

A) merely C) common
B) single D) simple

A．merely
B．single
C．common
D．simple
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单项选择题
The best title of the passage is ______. A) The Methods of Science C) How to Make Deductions B) The Air Pressure Hypothesis D) How to Form a Hypothesis
A．The best title of the passage is ______.
B．The Methods of Science
C．The Air Pressure Hypothesis
D．How to Make Deductions
E．How to Form a Hypothesis
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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