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They found that the majority of both kids and adults opted for a half-sized portion when combined with a prize.
出自-2016年12月阅读原文
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But because it's all digital it eliminates the used book market and eliminates any sharing and because homework and tests are through an access code, it eliminates any ability to opt out.
2018年6月四级真题(第三套)阅读 Section B
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But critics say the digital access codes represent the same profit-seeking ethos (观念) of the textbook business, and are even harder for students to opt out of.
2018年6月四级真题(第三套)阅读 Section B