国家决定：自2016年1月1日起，一对夫妇可以生育两个孩子．这是我国人口生育政策的重大调整，其目的是（　　）

已知等差数列$\left\{a_n\right\}$的通项公式为$a_n=\frac{72-3n}{4}$，设$A_n=\left\{a_n+a_{n-1}+\dots +a_{n-14}\right\}\left(n\in N^{*}\right)$,则当$\left|A_n\right|$取得最小值是，n的值是 (    )

    My husband and I had been married nearly twenty-two years when I acquired Stevens-Johnson syndrome,a disorder where my immune system responded to a virus by producing painful blisters（水疱）.Although my long-term evaluation was good,I,who had been so fiercely independent,rapidly became absolutely helpless.

    My husband,Scott,stepped up to the plate,taking care of kids and cooking dinners.He also became my personal caretaker,applying the medicine to all of my blisters because my hands couldn't do the job.Needless to say,I had negative emotions,bouncing from embarrassment to shame caused by total reliance on someone other than myself.

    At one point when I had mentally and physically hit bottoms I remember thinking that Scott must somehow love me more than I could ever love him.With my illness he had become the stronger one,and I the weaker one.And this disturbed me.

    I recovered from my illness,but I couldn't seem to recover from the thought that I loved my husband less than he loved me.This seeming distinction in our love continued to annoy me for the year following my illness.

    Then recently Scott and I went on a long bike ride.He's an experienced cyclist;I'm quite the green hand.At one point with a strong headwind and sharp pain building in my tired legs,I really thought I couldn't go any further. Seeing me struggle,Scott pulled in front of me and yelled over his shoulder,"Stay close behind me."As I fell into the draft of his six-foot-three-inch frame and followed his steps,I discovered that my legs quit burning and I was able to catch my breath.My husband was pulling me along again.At this very moment I woke up to what I now believe: during these and other tough times,love has the opportunity to become stronger when one partner learns to lean on the other.

    I pray my husband will always be strong and healthy.But if he should ever become the struggling one,whether on a bike ride or with an illness,I trust I'll be ready to call out to him: Stay close behind me—my turn to pull you along.

下列关于人类与生物圈的关系叙述，正确的是（ ）

提出“建立一个独立、自由、民主、统一、富强的新中国”的会议是（   ）