It suggested that people in Central and South America first gathered the cacao plant much earlier an
题目
It suggested that people in Central and South America first gathered the cacao plant much earlier and for a different use than experts once thought.
The researchers believe it was the interest in cacao as an alcoholic drink that led to the use of its bitter seeds to make what is now known as chocolate.
第一句and是和谁并列的?
第二句to make前面有个led to,怎么还会有to make,
答案
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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