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生活中数字的运用(价格、数量等) — 英语填空题

人教版(主编:吴欣)·英语 Unit 6 Numbers in life AI 三重审校通过

题目
At the school party, one red balloon is 7 yuan. One yellow balloon is 5 yuan. Amy buys two red balloons and one yellow balloon. How much does she pay? ___ yuan.