单项选择题

W.R. Grace is typical long-lived company that has nm the following business except ______.

A．sugar and tin
B．natural fertilizer
C．chemical products
D．air planes
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单项选择题
The longevity of successful companies is determined by ______.
A．knowledge on which they built their fortunes
B．easy access to natural resources from which they made money
C．their ability to learn and adapt to changes
D．information on packets carried over vast distances by portage and ship
单项选择题
Which of the following is the main topic of the passage
A．Standard speech.
B．Idiomatic speech.
C．Different types of speech.
D．Dictionary usage.
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