Some people eat,some people singing,some people dance.是一个句子正确的句子吗?
题目
Some people eat,some people singing,some people dance.是一个句子正确的句子吗?
答案
不正确 看你这句子 都应该用进行时 Some people are eating,some people are singing,some people are dancing或者Some people eat,some people sing,some people dancesinging是sing的进行时
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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．
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