Newton proved that it is ______ the moon is pulled out of a straight path and kept in orbit.
题目
Newton proved that it is ______ the moon is pulled out of a straight path and kept in orbit.
A.by the force of gravity
B.by the force of gravity which
C.by the force of gravity that
D.by the force of gravity with which
答案
C强调句
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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