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【简答题】求2~500以内的素数。

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【简答题】一个数如果恰好等于它的因子之和,这个数就称为“完数”。例如,6的因子为1,2,3,而6=1+2+3,因此6是“完数”。编程序找出1000之内的所有完数。

You are going to listen to a short talk on cell phones. Listen to the talk carefully and fill in the blanks with the missing words. We can't talk about today without talking about mobile phones or cell phones. We can't imagine what【填空1】without the gadget (小玩意) . It's true, isn't it?The cell phone has become【填空2】. Wherever you carry it, you can be reached; you can【填空3】for something; and you can do【填空4】, personal and business-related. Tell me how you would feel when you left your cell phone in the dorm.Frustrated, helpless or anxious (焦虑的) , wouldn't you? If your cell phone was damaged, you would【填空5】having it fixed. This is all because【填空6】without a cell phone.But the problem is that we take cell phones【填空7】for granted that we wouldn't notice their negative effects. Use your cell phone and go online【填空8】. I’m sure you will find it. Take my word for it!

我国对境内单位和个人提供的国际运输服务、向境个单位提供的研发服务和设计服务，适用增值税（）

A. 16%
B. 10%
C. 零税率
D. 5%

《黄帝内经》告诉我们：喜伤（），怒伤肝，忧伤肝。

A. 肾
B. 心
C. 脾
D. 胆