单项选择题

SEPTIC:

A． constant
B． consistently arranged
C． devoid of infection
D． of unidentified origin
E． shimmering
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单项选择题
According to the passage, in the Cepheid variable method all of the following have a significant role in the calculation of the distance of a galaxy EXCEPT
A． The intrinsic luminosity of a Cepheid
B． The comparative luminosity of ordinary stars
C． The observed brightness of the Cepheid
D． The data suggesting the expansion of the universe
E． The correction of the period-luminosity relation for the star being observed
单项选择题
In the passage, the author is primarily concerned with
A． identifying the differences between science and pseudo-science as they relate to skepticism
B． stressing the importance of employing the scientific method to assuage skeptics
C． proposing a new scientific approach which answers the objections presented by skepticism
D． offering a model of skepticism that is both useful to science and avoids the pitfalls of relativism
E． explaining the difference between the assumptions made by relativists and those made by skeptics
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