4. The sense of delayed gratification, of working now for later pleasure, has helped shape the economic behavior of our society. However, that sense is no longer nurtured as consistently in our children as it once was. For example, it used to take a bit of patience to put together the toys that children got in cereal boxes; now the toys come from the boxes whole. Which of the following is an assumption made by the argument? (C) The toys that used to come in cereal boxes were put together by the same children who played with them. 此為正確答案 但是我不懂為甚麼 > < 請問各位可以幫我解答嗎 謝謝 --

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