.20.In the United States,riding bicycles,as an ideal way of keeping fit,has become ______ popular.（1
题目
.20.In the United States,riding bicycles,as an ideal way of keeping fit,has become ______ popular.（1分）
A.instantly B.improvingly
C.increasingly D.obviously
.21.The cheerful smile ______ from her face when she heard the bad news.（1分）
A.vanished B.finished
C.accomplished D.established
答案
20.C
21.A
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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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