the man has devoted much of his time ( )South China tiger.
题目
the man has devoted much of his time ( )South China tiger.
A.to protect B.to protecting C.protected D.protects
答案
B.to protecting
devote time to doing sth.把时间投入到做某事当中/致于力做某事
句意:那个人把他的大部分时间投入到保护华南虎的事业中.
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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