题目

设f(x)=x(x-1)(x-2)…(x-1 000),则f′(0)等于__________________. 答案：答案：1 000!  f′(0)==(x-1)(x-2)…(x-1 000)=1 000!.We should combine our efforts to make sure our children are not _________ to bad living conditions．A.affectedB.exposedC.exposingD.effected