of all the students,Jack,who always works hard and gets good marks in the examination,is(a)n( )stude
题目
of all the students,Jack,who always works hard and gets good marks in the examination,is(a)n( )student in his class.
A.excellent B.more excellent C.excellenter D.most excellent
答案
D
most excellent 指的是非常优秀
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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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