Why do the seeds need lots of sun?怎么用英文回答?
题目
Why do the seeds need lots of sun?怎么用英文回答?
答案
because they can't grow without sunlight.
as we know ,it is called photosynthesis光合作用
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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