We are going to reduce the number of trees being cut down 去掉being可以吗?
题目
We are going to reduce the number of trees being cut down 去掉being可以吗?
答案
我们将减少正在被砍伐的树的数目.being cut down 是正在被砍伐的,在句子中作定语；如果去掉being,意思成了“已经砍伐的树的数目”We are going to reduce the number of trees which are being cut down (now).（完...
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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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