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__________ (Necessary) is the mother of invention. This is r
__________ (Necessary) is the mother of invention. This is remarkably true.
下图右侧的4个图形中，不是左侧立体物件的投影图的是（ ）。
下图右侧的4个图形中，不是左侧立体物件的投影图的是（ ）。
How many grand slams has Serena Williams won this year?
How many grand slams has Serena Williams won this year?A． 1. B． 2. C． 4. D． 13.
__________, many good opportunities were neglected in my lif
__________, many good opportunities were neglected in my life.A． In the vicinity
回答题错误1：__________
回答题错误1：__________