To pick up a hare is ceitainly sasier than to work in the field,按照这个例子举出3个句子
题目
To pick up a hare is ceitainly sasier than to work in the field,按照这个例子举出3个句子
答案
To learn a language is certainly easier than to make a rocket.
To walk to school is certainly safer than to ride a bike to school.
To take a plane to get to Beijing is certainly quicker than to talk a train to go 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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