将下列陈述句按括号内的内容变为强调句:1.(The children )often help their parents do the farm work.2.(In 1993),a tomato w
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将下列陈述句按括号内的内容变为强调句:1.(The children )often help their parents do the farm work.2.(In 1993),a tomato was developed that was very different from any grown before.
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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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