Look!The firemen ( ) the fire in the building.A put out B put off Care putting out D are putting e
题目
Look!The firemen ( ) the fire in the building.A put out B put off Care putting out D are putting e
答案
C 1.由look可知用现在进行时 2. firemen 是集体名词,用复数
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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