1._____ is important for us to learn English well.
题目
1._____ is important for us to learn English well.
2.______is a waste of money taking so many things that we don't need.3.______will be a sports meeting tomorrow.5.________was very cold yesterday.6.______were some farmers working in the field.用it或there填空
答案
1 It
2 It
3 There
5 It
6 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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