单项选择题

What does Mrs. Daniels teach

A．She teaches Tracey English.
B．She teaches Tracey math.
C．She teaches Tracey art.
D．She doesn't teach Tracey.
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单项选择题
It can be inferred from the passage that both Apple and IBM try to gain a competitive advantage by ______.
A．copying each other's technology
B．incorporating features that make their products distinctive
C．making their computers more expensive
D．making their computers run much faster
单项选择题
According to the passage, Apple computer, Inc, has introduced the Mackintosh Ⅱ and the Mackintosh SE because ______.
A．IBM is changing its computer models continuously
B．it wants to make its machines specialize in specific users
C．it wants to stay ahead of IBM in the competitive computer market
D．it expects its major competitor IBM to follow it examples
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