计算下面圆柱的表面积．

实验室制取某些气体的装置图如下．请按要求回答下列问题．

（1）写出图中标号①的仪器名称：____ ．

（2）选用B、C装置制取氧气的化学方程式为　____ ；当实验结束时先熄灭酒精灯，后将导管从水槽中取出，其后果是____ ．

（3）实验室制取二氧化碳选用的药品是____ ，选用的发生装置和收集装置是____ ．

阅读下面材料，在空白处填入适当的内容（不多于3个单词）或括号内单词的正确形式。

For many years, volunteers, both young and old, have been helping the poor and elderly people of this area. They work long hours building wheelchair paths, fixing leaky(有漏洞的) roofs and repairing the homes of those____ need help. Their only payment is the happy smiles and grateful hearts of the people whom____have helped.

I will always remember one man in particular____he has a real enthusiasm for voluntary work. He seemed to have inspired all the people in his group with his____(cheer) spirit. Every day when I asked him____he was doing, he would reply, “I'm doing good!”____the end of the month as he was preparing to leave, I looked at all the homes he ____(fix) and had to agree that he was indeed doing____good job!

A nice house, a successful career, and a lot of money might be nice to have, but____(compare) with fixing others' home and helping those who are in need, their____(significant) is not so great.

被誉为“山西紫禁城”和“华夏第一宅”的王家大院，包含三大建筑群，共有大小院落123座，房屋1118间，面积共45000平方米。类似王家“以商贾兴”的商人群体的出现，是明清时期商业活动的一大特色。下列说法有误的是（    ）

汉武帝时期，儒家思想开始成为封建社会的统治思想，主要是因为（  ）