What is the main topic of the passage?

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问题 What is the main topic of the passage?
Today, I ask you to focus on the challenges of the Information Age. The dimensions of the Information Revolution and its limitless possibilities are widely accepted and generally understood, even by lay people. But to make the most of it, we must acknowledge that there are challenges, and we must make important choices. We can extend opportunity to all Americans or leave many behind.We can accelerate the most powerful engine of growth and prosperity the world has ever known, or allow the engine to stall.

选项 A、Opportunities for All Americans
B、Challenges of the Information Age
C、Engineering and Industrial Revolution
D、Progress and Prosperity

答案B

解析 1)注意提示主旨的词语,如首句中focus on明确了其后内容即为全段主旨内容;2)注意段落行进的方式。本段首先提出普遍认同的观点,而后使用信号词 but,提示听者注意后面的内容是说者讨论的重点内容,应为全段主旨。因此对于类似段落,听者应注意段中表转折的词语后面的内容。
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