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素数是什么?概念~
整数和全体整数的区别?有一道题是这样的:Z={全体整数}对还是不对?全体整数组成的集合称为整数集,记作:Z={0,.......}但这道题的答案是不正确,应写成Z={整数}
Listen to----------sister!答案为her and her对吗?我觉得应该是she and her
keep adj.为状态keep doing sth.为什么?keep on doing sth.是保持连续不断的做某事We kept the windows--------in our classroom.答案是 open(adj.)那么opening不行吗?The window is open .窗户是开着的。 We keep it.open。我们让它开着。 .[ 本帖最后由 naroad 于 2008-6-23 ...
感叹词的应用用于不可数名词时------bad weather!Idon't want to go out.
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