单项选择题
Questions 11—13 are based on the passage you have just heard. You now have 15 seconds to read Questions 11—13.
How much did the sales of all makes of desktop machines drop in the third quarter
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A.46.8 percent
B.43.8 percent
C.53.8 percent
D.56.8 percent
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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.
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