决定晋文公成为中原霸主的战争是______,与之有关的成语是_____,晋楚争霸持续百余年,最后,_____打败了晋国,做了中原霸主。
城濮之战;退避三舍;楚庄王
已知函数f(x)=ax-x-a(a>0,a≠1),那么函数f(x)的零点个数是
A.0个
B.1个
C.2个
D.至少1个
—What will you do if it _______ tomorrow?
—I'll stay at home and watch the match on TV. [ ]
A. rain
B. rains
C. will rain
D. is raining