正确形式填空1.the bus ____(go),it left half an hour ago.2.tody you can buy ____ (hundred) of icr cream 3.s
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正确形式填空1.the bus ____(go),it left half an hour ago.2.tody you can buy ____ (hundred) of icr cream 3.scientists_____(discover) already that people,can study while they are sleeping 4.the great author ____(writer)many popular books already
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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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