Write the correct he/she/it form of these verbs .the first one has been done for you.
题目
Write the correct he/she/it form of these verbs .the first one has been done for you.
1:cross________2:fix_______3:stay________4:study_________5:allow_________6:be________7:want________8:begin_______9:wash_______10:do_________11:tidy_______12:like:_______
答案
1.crosses 2.fixes 3.stays 4.studies 5.allows 6.is 7.wants 8.begins 9.washes 10.does 11.tidies 12.likes
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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