题目

If you are in Shanghai and want to throw away a cup of milk tea, be careful. You need to follow these steps: first, pour out any leftover into a wet waste bin; second, put the paper wrapper into a recyclable waste bin; third, throw the single-use cup into a dry waste bin.Sound difficult and annoying? You'll have to get used to it. From July 1st on, people in Shanghai are required to sort their garbage according to strict rules.Why should we sort our garbage? The answer lies in the increasing amount of waste we are producing. Chinese cities produce over 200 million tons of waste each year, acco等差数列{an}的前n项之和为Sn，已知a5a3=59，则S9S5=（　　）A．1B．-1C．2D．12