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?