造句:be bad at sth be busy doing be busy with sth be excited about sth
题目
造句:be bad at sth be busy doing be busy with sth be excited about sth
还有be good at sth be good for sb be late for sth
be made of sth be ready to do sth become interested in
答案
He is good at math,so he always does well in the math exams.He is very kind and he is very good for everyone.I'm sorry.I'm late for school.The desk is made of wood.We are ready to have a walk now.Afte...
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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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