填介词：Little David is always()his mother Listen!They are talking ()the new art teacher.
题目
填介词：Little David is always()his mother Listen!They are talking ()the new art teacher.
Some () my friends are playing volleyball there.
答案
Little David is always with his mother .Listen!They are talking about the new art teacher .
Some of my friends are playing volleyball there .
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．
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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