这些英语句子怎么改形式?
题目
这些英语句子怎么改形式?
this is a piano(改复数)
that knife is short(改复数)
is it a spoon?(改复数)
are they old cooks?(改单数)
are those girls new?(肯定句)
are these pencil-boxes old?(肯定句)
答案
this is a piano(改复数)These are pianosthat knife is short(改复数)Those knives are shortis it a spoon?(改复数)Are they spoons?are they old cooks?(改单数)Is he / she an old cook?楼上朋友错了这...
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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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