“There’s no such thing as a free lunch.” What is your opinion of the proverb?
题目
“There’s no such thing as a free lunch.” What is your opinion of the proverb?
答案
口语考试吧……哈哈
The economic theory,and also the lay opinion,that whatever goods and services are provided,they must be paid for by someone .you don't get something for nothing.
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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