公差不为零的等差数列{a_n}的前n项和为S_n．若a₄是a₃与a₇的等比中项，S₈=32，则S₁₀等于（　　）

如果执行图中的程序框图，那么最后输出的正整数i＝（ ）

B

    Have you ever stayed in a hotel? Most Chinese hotels often provide guests with things like disposable (一次性的) toothbrushes, toothpaste, shampoo and slippers. Many guests like the idea because they don't have to bring their own. But, if you travel to Beijing, remember to bring your own things. Starting from June, some hotels in Beijing will no longer provide guests with these disposables. They want to ask people to use less disposable things.

    Many disposable things are made of plastic. People throw them away after only using them once. It is a waste of natural resources (资源) and is very bad for the environment. Do you know, one Chinese person makes as much as 400kg of waste a year! Most of that waste comes from disposable things. In Beijing, people throw away about 19,000 tons of plastic bags and 1,320 tons of plastic lunch bowls every year! Plastic can take between 100 and 400 years to break down. So the less plastic we throw out, the better. So, wherever you travel, bring your own things and use them again and again.

    Back at home and school, you can also do something to make our world a better place. Try to do these things in your daily life: Use cloth shopping bags, not plastic ones. After using a plastic bag, wash it out and let it dry. Then you can use it over and over again. Do not use paper cups. At your school canteen（食堂）, use your own bowl and chopsticks instead of disposable ones.

一根绳子长 $\frac{4}{5}$ 米，比第二根绳子长 $\frac{1}{4}$ 米，第二根绳子长____米。

右图是关节结构模式图，据图回答：
 
（1）关节能灵活运动是因为____ 和____ 的表面覆盖着光滑的关节软骨，可以减少骨与骨之间的摩擦；3 ____ 内有少量滑液，起润滑关节软骨的作用。
（2）____ 把相邻两骨连接起来，其里面和外面都有坚韧的____ ，由此可见，关节具有牢固性。
（3）任何一个动作的完成，都是在____ 的支配和其他系统的辅助下，由骨骼肌牵拉着骨绕着____ 活动而产生的。