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Oprah has been able to share her good luck with others while keeping her promise to focus “The Oprah Winfrey Show” on subjects that will encourage her viewers. Each week her shows covered such topics as spirituality, fitness, relationships, steps towards financial freedom and more.

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A typical instant-messaging conversation lasts more than a half hour, includes three or more friends and often includes friends from different places. More than one in three IM users say they use it every day. Nearly half of online teenagers believe that the Internet has improved their friendships. It's a quick, easy way to keep in touch.

一下属于炸药爆炸特点的是（）。

A. 放出热量
B. 生成气体产物
C. 反应的高速度
D. 发生过程缓慢

已知函数=x²+4x，当-4

A. a>4
B. a≤-2
C. -4 D. -4≤a≤-2

三个相邻偶数之积是一个六位数,这个六位数的首位数字是8,末位数字是2,则这三个偶数是____.