题目内容
20．A number of usefulinventions （invent），such as smart phones，have changed our lives．分析 许多有用的发明，如智能手机，已经改变了我们的生活．
解答 答案：inventions
联系语境，根据useful为形容词，所以可以判断出其后应该跟名词来对它起修饰作用；结合给出的提示词invent为动词"发明"，其名词形式为invention；再根据关键短语a number of 意为"许多，大量的"，其后应该跟可数名词的复数形式，所以此处应该用invention的复数形式inventions，指许多有用的发明．故填写：inventions
点评 此题考查动词和名词之间的转化．做题时抓住关键词判断出词性及单复数是重点，据此作出形式上的变化即可．
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（1）文中不得出现真实姓名和学校名称；
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（3）词数80左右，文章的开头已经给出，不计入总词数．
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（1）文中不得出现真实姓名和学校名称；
（2）语言通顺、意思连贯，条理清楚，书写规范；
（3）词数80左右，文章的开头已经给出，不计入总词数．
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