In 1929,three years after his flight over the North Pole,the American explorer,
题目
In 1929,three years after his flight over the North Pole,the American explorer,
R.E.Byrd,successfully flew over the South Pole for the first time.为什么第一个用flight,第二个用flew.
答案
第一个是名词,第二个是动词过去式.前半个句子是个短语,不需要动词.
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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