单项选择题

According to the passage, the initial concern about computers was that they might______.

A．change our personal lives
B．take control of the world
C．create unforeseen problems
D．affect our businesses
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单项选择题
The passage is mainly about______.
A．what physical features the giraffe has
B．how the giraffe's heart works
C．how the giraffes heart pumps blood to its head
D．how the giraffes can stand up to high blood pressure
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