题目内容
3．-Is this your backpack？-______．（ ）
| A． | Yes，it's | B． | Yes，it is | C． | yes，it is | D． | It is |
分析 --这是你的背包吗？
--是的，它是．
解答 答案：B．考查交际用语．句意"--这是你的背包吗？--是的，它是．"．Is this…？这是…吗？一般疑问句，肯定回答用Yes，it is．开头字母大写，因此C不正确．it is不能缩写，因此A不正确．D选项也不符合．答案是B．
点评 考查交际用语，在日常学习中要从实际情景交际中多练习，掌握一些习惯用语．结合语境，分析选项，选择正确的回答，完成练习．
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