题型:问答题 简答题 若f(x)是定义在R上的函数,对任意的实数x,都有f(x+4)≤f(x)+4和f(x+2)≥f(x)+2,且f(1)=0,则f(2013)的值是[ ]A.2010B.2011C.2012D.2013 查看答案
题型:问答题 简答题 —Why didn’t you tell him about the exciting news? —He rushed out of the room ______ I could say a word.A.beforeB.afterC.whenD.until 查看答案