单项选择题

This passage is most likely extracted from ______.

A．an advertisement on PCs
B．a primary school textbook on science
C．an article introducing the latest developments in the computer world
D．a research paper on the functioning of the computer
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单项选择题
LCD screens are ______CRT screens.
A．three times the price of
B．cheaper than
C．are almost of the same price as
D．twice the price of
单项选择题
It can be inferred from the passage that if the flock of birds were navigating by compass sense alone, they would, after the storm, fly______.
A．east
B．north
C．northwest
D．south
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