新概念英语青少版2a 131521232527课课文哪里找?
题目
新概念英语青少版2a 13\15\21\23\25\27课课文哪里找?
急呀,5月份要比赛!
答案
2A 13单元课文 The Kalenjin
Take a look at the records of international running events in the last fifty years.Before 1980,the winners of distance races were usually from North America and Europe.There were some winners from other counties ,but there were't very many of them.There were no Africa names among the winners then,but things are very different now.
Today the stars of the race track are Kalenjin.The Kalenjin are an Africa people from the borders of North West Kenya and Ethiopia.Their homeland is a hot ,dry plateau,about 2,500 metres above sea level.THese people are natural athletes .They have long,thin legs.Their heart rate is usually slow.There are long three million of them.
Twelve of the world's top twenty marathon runners are now Kalenjin.Every year ,they win40 percent of the top honours in all international distance races .And it's not just the men.
A few years ago,there were't any distance races for women.These days,there are lots of them .Kalenjin women win all their events as well.
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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