When he is ,he becomes interested in science.
题目
When he is ,he becomes interested in science.
a.on his thirties b.in his thirty c in his thirties d.at his thirties 的意思!
答案
abd是错误搭配,英语中没有这种介词短语.C是正确短语,in ones thirties指在某人三十几岁的时候
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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