单项选择题

The central idea of the passage is

A．scientific knowledge is based on verifiable evidence.
B．science does not have answers for verifiable evidence.
C．science has no absolute truths.
D．the scientific method requires that all conclusions be open to reexamination whenever new evidence is found to challenge them.
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单项选择题
Which statement is true
A．A question is important and therefore it is scientific.
B．A question is unscientific and therefore no scientist believes it.
C．A fact is a descriptive statement upon which all qualified observers agree in believing to be accurate.
D．Scientists sometimes study metaphysics.,
单项选择题
The author mentions the stump speech in paragraph 2 as an example of
A．an event created by politicians to attract media attention.
B．an interactive discussion between two politicians.
C．a kind of political presentation types of the nineteenth century.
D．a style of speech common to televised political events.
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