1.Jack was still sitting on the chair when the lights _____.
题目
1.Jack was still sitting on the chair when the lights _____.
A.stood up B.put down C.went out D.broke into
2.December 12 is my ____ birthday.
A.the fifteenth B.fifteen years old C.fifteenth D.fifteen
答案
第一题为B 第二题为C
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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