题目

Directions: For each blank in the followingpassages there are four words or phrases marked A, B, C and D. Fill in eachblank with the word or phrase that best fits the context.Next week, as millions offamilies gather for their Thanksgiving feasts(大餐), many other Americans will go without.According to the United States Department of Agriculture, more than 12 millionhouseholds 1 enough food for everyone intheir family at some time during the year — including 2.Hunger is surprisinglywidespread in our country — one of the world'swealthiest — yet the governmentestimates that we waste almos给出下列说法：①幂函数的图象一定不过第四象限；②奇函数图象一定过坐标原点；③y=x2-2|x|-3的递增区间为[1，+∞）；④定义在R上的函数f（x）对任意两个不等实数a、b，总有成立，则f（x）在R上是增函数；⑤的单调减区间是（-∞，0）∪（0，+∞）．正确的有 ________．