As a greatinvention.the smart phone is widely used in many ways．题目和参考答案——青夏教育精英家教网—

11．As a greatinvention（invent），the smart phone is widely used in many ways．

分析作为一个伟大的发明，智能手机在许多方面被广泛使用．

解答答案：invention．as表示作为…，是介词，a great 为形容词后加名词单数，invent是动词发明，名词是invention．故答案是invention．

点评 tion附在动词后面构成名词，表达其名词形式．例如instruct（v．指导）可变成instruction（n．）其实tion就是表示这个词是名词．
1、当单词最后是t，d．te，de时，变名词加tion或者ation，ition；
2、当单词最后是元音字母时，变名词加sion等．

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