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题目
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1 He has repaired the tap that was found ( ).leak/leaking/leaked
2 The accident ( ) because it was very foggy that evening.did happen/ has happened /happened
3 I was told that the trains ( ) run on Thursday,but they did.did not might/may not/might not
4 I must telephone him before he ( ) away.will go/has gone/goes
5 Ten years ago there was a lot of traffic in britain.Now there is ( ).too much/a lot/much
答案
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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