there _ _ baskball on the desk.(否定句填空)
题目
there _ _ baskball on the desk.(否定句填空)
_ _ a ball behind the door?Yes,_ _.(疑问句填空,并肯定回答)
there are _two_ computers in the office.(划线处提问)
_ _ computers _ _ in the office?
答案
isn't any
Is there...there is
How many...are 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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