4.the sun rises in the east and sets in the west,so it seems as if the sun(）round the earth.
题目
4.the sun rises in the east and sets in the west,so it seems as if the sun(）round the earth.
A.were circling B.circles C.is circling D.be circling
答案
A
虚拟语气,因为事实上并非如此
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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