题目内容
16．-What are these knivesused for？-They're used for cutting apples．
分析 --这些刀子是用来干什么的？
--是用来切苹果的．
解答 答案：knives．
根据所给首字母提示结合答语"是用来切苹果的．"推测问句的句意是"这些刀子是用来干什么的？"，根据设空处前面的these判断设空处缺少可数名词复数形式，所填单词"刀子"是knife，所以答案是：knives
点评 做这类题型，首先根据所给单词首字母明确句子所要考查的单词的拼写，再结合相关语法知识对单词做出形式上的变化．
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