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
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
单项选择题
Which of the following issues is NOT mentioned in the passage
A．E-commerce.
B．The MFN concept.
C．China's entry into the WTO.
D．Tariff reductions.
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