there _ _ baskball on the desk.(否定句填空)

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
奥巴马演讲不用看稿子.为什么中国领导演讲要看?
想找英语初三上学期的首字母填空练习……
英语翻译
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