when was the ...invented? who were they invented by? what ane they used for?造一对话.
题目
when was the ...invented? who were they invented by? what ane they used for?造一对话.
如上
答案
A: When was the telephone invented?
B: It was ivented about 1 hundred years ago.
A: Who were they invented by?
B: They were invented by Bell.
A: What are they used for?
B: They are used for calling people far away of you, so we can get iontouch with people easier.
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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