单项选择题

Polarized light is a probably phenomenon characterized by its ______.

A．rotational symmetry.
B．charged particles.
C．radiation flashes.
D．frequent twists.
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单项选择题
The departure of the splendid Hale-Bopp comet is mentioned______.
A．to honor the contributions of Hale-Bopp.
B．to introduce to the topic of new report on cosmic matters.
C．to challenge the basic tenets of astronomy.
D．to recount the reactions of the public to the comet.
单项选择题
It is evident that, in speculating about twisting effects, Nodland and Ralslon focused mainly on______.
A．unconventional measurement instruments.
B．assumptions and deductions.
C．references to scientific literature.
D．discrimination against basic doctrines.
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