题目内容

10．---Is she your sister？---No，________．（　　）
A．it isB．it isn'tC．he isD．she isn't

分析 --她是你的姐姐吗？
--不，她不是．

解答 答案：D．考查交际用语．句意"--她是你的姐姐吗？--不，她不是．"，Is she…？一般疑问句，肯定回答是Yes，she is．否定回答是No，she isn't．答案是D．

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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根据短文内容选择最佳答案．
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B．to introduce the harmful chemicals and soil erosion
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