求一篇300字左右的英语作文 题目是MOBILEPHONE
题目
求一篇300字左右的英语作文 题目是MOBILEPHONE
答案
Mobile Phone
Being a product of high-technology,mobile phones are being more and more widely used.It's small in size,light in weight and easy to carry,offering fast and convenient service for communication.It's of multi-function.The users use it for calling,sending short messages and internet-surfing.
In recent years,mobile phones have become popular among middle school students.Quite a few use them at school to keep in touch with their families and friends instead of writing letters,which,of course brings convenience to them.But I don't think it's good to do so.
In spite of the advantage mentioned above,student users often waste a lot of time chatting over the phone in their spare time,some even use them to cheat in exams.In addition,mobile phone bill is also a heavy burden on students' families.
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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