关于传感器的应用，下列说法中正确的是（   ）

在各项均为正数的等比数列$\left\{a_n\right\}$中,公比$q\in (0,1)$．若$a_3+a_5=5$,$a_2{a}_6=4$ ,$b_n={\log }_2{a}_n$数列$\left\{b_n\right\}$的前$n$项和为$S_n$,则当$\frac{S_1}{1}+\frac{S_2}{2}+...+\frac{S_n}{n}$取最大值时,$n$的值为（   ）

    Cathy, Judy, Bella and Ellen are four good friends in Maryland, the USA. They go to the same school and always stay together. However, they are going to spend this summer holiday in different places. Ellen is going to visit her grandparents in Greece. Judy plans to stay at home and work in an ice-cream shop. Bella will (将) go to a football club in Mexico, and Cathy has  to visit her uncle in South California. Before leaving (离开), the four girls go shopping  together, and  they find a nice pair of jeans in a shop. To their surprise, the jeans ft all of them, so they buy the jeans and call them the Travelling Jeans. They want to share the jeans and their different stories in the coming summer. They have a good idea. Everyone can wear the jeans for some days, and then send them to the next one. It will make them feel like they are always together. What a lovely idea it is!

依次填入下面一段文字横线处的语句，衔接最恰当的一组是（    ）

教育的本质是培养人。          。          。          。          。          。

这其实也正是儒家的理想，追求“时中”，追求动态中的恰好。

①教育应该因材施教，使每个人充实而光辉

②但在现实的层面，总是需要对人有个评估，这就免不了考试

③从理想的层面讲，人皆可以为尧舜

④作为一个教师，应正视这个现实，在充满张力的境遇中寻找某种平衡

⑤应试教育也就应运而兴