Reading Comprehension: Main Idea Questions

The passage is primarily concerned with which of the following?

Incorrect.

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This answer choice is too general. While the passage is concerned with the commercialization of several scientific inventions, it focuses on a certain field (electricity distribution) and on a specific period (the end of the 19th century).

Incorrect.

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This answer choice is too general. The passage focuses on the electric distribution systems these men promoted, not all their business ventures (which may have been many).

Incorrect.

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This answer choice is too narrow. The personal rivalry between Edison and Tesla is discussed in the third paragraph only.

Incorrect.

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This answer choice is too narrow. The advantages that helped AC defeat DC are mentioned only in the fifth paragraph.

You're right!

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The passage revolves around the War of the Currents, a competition in which each side sought to have its electricity distribution method (AC and DC) adopted by residential and industrial consumers.

Commercialization of scientific inventions
The discoveries and business ventures of Edison, Tesla, and Westinghouse
The personal rivalry between Edison and Tesla
The advantages that helped AC defeat DC
The commercial competition between direct current and alternating current

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