单选题：The passage mainly discusses __________.

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题目类型：单选题
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题目内容：

The passage mainly discusses __________. A．the differences in average income among countries
B．the relationship between productivity and living standards
C．the causes of the rise in living standards
D．the importance of raising productivity

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The word "invade" in Paragraph 4 is closest in meaning to__________A．come in wi

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It can be inferred from the passage that__________

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Spielberg is very good at __________

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