Read the text below, which is entitled "Time to Toss the Textbook", in order to answer questions 27 to 30. Read the text below, which is entitled "Time to Toss the Textbook", in order to answer questions 27 to 30. The text is introduced by

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Q175

Read the text below, which is entitled "Time to Toss the Textbook", in order to answer questions 27 to 30.

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