用am,is,are填空.
题目
用am,is,are填空.
1.This _____ a bus.That _____ a car.
2.You _____ a pupil.I _____ a teacher.
3.Mary _____ a girl.
4.What _____ this?It's a desk.
5._____ this your cup?Yes,it_____.
答案
1.This _is____ a bus.That _is____ a car.
2.You _are____ a pupil.I ____am_ a teacher.
3.Mary __is___ a girl.
4.What __is___ this?It's a desk.
5.___Is__ this your cup?Yes,it___is__.
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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