1.The sun shuining（ ) the sky 2.There is a boat（ )the river 3.Sally is looking ( )the aeroplane
题目
1.The sun shuining（ ) the sky 2.There is a boat（ )the river 3.Sally is looking ( )the aeroplane
4.There is a desk（ ）the window 5.The little boy is sunning ( )his mother 6.I am walking ( ) my mother 7.My brother is running
有这些词：with on over in off at after near
答案
1 in 2 on 3.at 4.near 5.with 6 .after 7.off
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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