题目

If you had only one arm (胳膊), what would you do? Zhang Jiacheng is showing a surprise to us.Born in Guangdong, Zhang lost half of his right arm in an accident (事故) when he was five. With only one arm, the boy couldn't do many things easily. However, he still has love for basketball and never loses hope of being a basketball player.How can he play basketball with just one arm? Many children had such a question. Work hard. was his answer. Zhang kept practicing basketball every day. Now he is getting better and better at the sport.A video of him playing basketball was popular online. In t若函数f（x）=3ax-2a+1在区间[-1，1]上没有零点，则函数g（x）=（a+1）（x3-3x+4）的递减区间是A.（-∞，-1）B.（1，+∞）C.（-1，1）D.（-∞，-1）∪（1，+∞）