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什么是标识用户、组和计算机帐户的唯一数字？()

A. SID
B. LSA
C. SAM
D. SRM

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下面几位历史人物。属于一朝开国国君的是()。

A. 汉武帝
B. 纣
C. 汤
D. 唐太宗

下列历史事件按时间先后排序正确的一组是()。

A. 戊戌变法——马关条约——五四运动
B. 郑和下西洋——戚继光抗击倭寇——郑成功收复台湾
C. 张衡发明地动仪——诸葛亮写《出师表》——张骞出使西域
D. 虎门销烟——中日甲午战争——第一次鸦片战争

You have been working in a company White & Associates for five years. But now you decide to quit because you are moving to another city with your parents. Write a letter to your boss, Mr. Brown, telling him your decision, stating your reason(s), and making an apology.

You were unable to attend Mr. Wongs examination on Academic Writing because you got sick that morning. Write a letter to express the reasons for not being able to attend it, apologize and suggest a solution.