【单选题】
Thats the main reason_________ the development of adult education.
【单选题】
That was a good idea and the government finally_________ it.
【单选题】
Everyone gets older, but you look ______ than ever.
【单选题】
His new book___ next month.
【单选题】
The lives of many people have been enriched_________ adult education.
【单选题】
Adult schools have become popular and the enrollment has_________ rapidly.
【判断题】
若某个线性方程组相应的齐次线性方程组只有零解,则该线性方程组有唯一解。
【判断题】
若X,Y是随机变量,则其数学期望一定有E(XY)=EXEY.
【判断题】
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