下列哪一项不是肺泡与气体交换相适应的特点（　　）

等差数列$\left\{a_n\right\}$的前n项和为S_n, 公差为d, 已知${\left(a_8+1\right)}^3+2013\left(a_8+1\right)=1$${\left(a_{2006}+1\right)}^3+2013\left(a_{2006}+1\right)=-1$, 则下列结论正确的是   （   ）

小红买了22枝铅笔，给了妹妹8枝铅笔，还剩下____枝。

A

    The Double Ninth Festival is a traditional (传统的）Chinese festival. It usually comes in October or November. On this day，people always wear the zhuyu (茱萸）plant. They usually climb mountains. Sometimes they go to see flower shows. The Double Ninth Festival is a festival for old people. People usually visit their parents and grandparents on this day. They often eat Double Ninth cakes together.

演示实验2如图2中，通、断电瞬间，变阻器滑动片快速移动过程中，线圈A中电流发生____，导致线圈B内磁场发生____，变强或者变弱（线圈面积不变），从而引起线圈中的____发生变化，有____电流产生；当线圈A中电流恒定时，线圈内磁场____，无电流产生．