He has got _____ useful book.______ was bought by his father.
题目
He has got _____ useful book.______ was bought by his father.
A)a...The B)an...The C)the...A D)the...An
答案
A)a...The
useful以辅音开头,因此第一空用a,第二次提到某物用the .故第二空用the.
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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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