Joe and Jack are ____ (谈论) about the year 2020. "What will our world be like in the year 2020?" "I don't know," says Jack. "What do you think?" "Well, no one ____ (知道), but it's interesting to guess." "In the year 2020, ____ (千) of people will buy a pocket computer. The computer will ____ （改变） people's life. They will give people the answers to all their questions. We shall all have ____ (电话) in our pockets, too.

    And we'll be ____ （能够） to talk to our friends all over the world. ____ (也许) we can see them at the same time." "A lot of people will live and work under the sea. Perhaps there will be big towns, factories and farms under the sea, too." "____ (机器) will do most of the work, so people will have more ____ (空闲的) time, perhaps they'll work only two or three days a week. They can fly to the moon by spaceship." "I'm looking forward to ____ (参观) the moon!" "And I hope I can live under the sea." says Jack " Won't that be interesting? Just like a fish!"

— Is she your ____ (mother, sister)?

— Yes. She is.

一铝壶中装有5kg的水，放在煤气灶上加热，将水从20℃加热至沸腾（在1标准大气压下），在此过程中：

可持续发展就是既满足当代人的需求，又不损害后代人满足其需求能力的发展。下列与可持续发展要求相符的有（  ）
①推进荒漠化、石漠化、水土流失综合治理          ②常使用一次性纸巾、木筷子
③强化水、大气、土壤等污染防治                          ④支持节能低碳产业和新能源、可再生资源发展