Unit Three is the most interesting of Book Three.
题目
Unit Three is the most interesting of Book Three.
还有两题翻译，求
He is talking with others happily all the time.
He is one of the tallest basketball players in the world.
如回答全面，
答案
第三单元是第三册书中的最有趣的.
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．
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