what is history?definition of history
题目
what is history?definition of history
答案
1 the study of past events,particularly in human affairs :medieval European history.
• the past considered as a whole :letters that have changed the course of history.
2 the whole series of past events connected with someone or something :the history of Aegean painting.
• an eventful past :the group has quite a history.
• a past characterized by a particular thing :his family had a history of insanity.
3 a continuous,typically chronological,record of important or public events or of a particular trend or institution :a history of the labor movement.
• a historical play :Shakespeare's comedies,histories,and tragedies.
举一反三
已知函数f（x）=x，g（x）=alnx，a∈R．若曲线y=f（x）与曲线y=g（x）相交，且在交点处有相同的切线，求a的值和该切线方程．
我想写一篇关于奥巴马的演讲的文章,写哪一篇好呢?为什么好
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