题目

连词成句 (1) your, this, is, pencil (2) an, book, English, is, it (3) you, do, book, how, spell (4) a set of, is, this, keys (5) is, what, that 答案:Is this your pencil? It is an English book. How do you spell book? This is a set of keys. What is that?解决问题. 一架飞机的速度是一列火车的多少倍?
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