利用分子的知识解释下列问题，请选择合适的选项：A、分子不断运动，温度升高时运动加快。B、分子很小。C、分子之间有间隔，温度发生变化时，间隔大小随之改变。酒精温度计能指示温度高低，是因为____。夏天的水比冬天蒸发得快，说明____。糖水可以透过滤纸，说明____。可以将大量的氧气压缩到天蓝色的钢瓶中，是因为____。

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.

这些机器人这么聪明能干____看来真是果农的好帮手呢____可是果农还是不太满意____如果没有电____他们是要____罢工____的____果园那么大____到处是果树____不可能让机器人拖着长长的电线走来走去____