用所给单词的正确形式填空1.These sheep __(be) white.2.These___(be) a pen and twopencils in the box 4.Are those __
题目
用所给单词的正确形式填空1.These sheep __(be) white.2.These___(be) a pen and twopencils in the box 4.Are those ___(mouse) in the picture?
6.Jim spent three years ___(learn) Chinese before he came to China .
7_____(hundred) of people took part in the party last night.
答案
are
are
mice
learning
Hundreds
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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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