What does the key sentence introduce?
How many causes of air pollution are stated?
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What does the key sentence introduce?
How many causes of air pollution are stated?
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Answer:
Calling it a “key sentence” reminds us that it expresses the central idea of the paragraph. ... First, they establish the main point that the rest of the paragraph supports. Second, they situate each paragraph within the sequence of the argument, a task that requires transitioning from the prior paragraph.