九年级新目标英语72页3b怎么写
题目
九年级新目标英语72页3b怎么写
答案
The flying disk is a toy which was invented by a group of college students.It was invented in the 1950s.
In fact,the students didn’t invent it.
They just discovered it.The original flying disk was really a metal pie plate from a bakery named Bridgeport in Connecticut.The students there liked to eat the bakery’s pies.And then they threw the pie plates around.A company began making plastic disk.Now there are flying disk clubs,a flying disk magazine,and even a national flying disk festival in September.
Don’t you think it’s amazing that all this started from a pie plate?
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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