what's that?(those)、This is a dog.（these）、He's a teacher.（they）、is this a new book
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what's that?(those)、This is a dog.（these）、He's a teacher.（they）、is this a new book
what's that?(those)、This is a dog.（these）、He's a teacher.（they）、is this a new book（these）改复数 括号里的是提示
答案
1、What's that?(those)What are those?那些是什么?2、This is a dog.（these）These are dogs.这些是狗.3、He's a teacher.（they）They are teachers.他们是老师.4、Is this a new book?（these）Are these new bo...
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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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