红孩儿使出「三昧真火」，只见红焰焰、大火烧空，悟空一时不能得胜，于是面见四海龙王商借雨水，四人平均时雨量为370毫米，东海龙王时雨量300毫米，西海龙王350毫米，南海龙王400毫米，问北海龙王时雨量几毫米？

    No one knows what our life will be like in the future. Here are some children's  1.

    Cindy: In the future, people will have more holidays. They2a lot of time to travel around the world. Maybe some families will go to the moon  3 their holidays.

    Gary: I think the earth will be more crowded and polluted. Maybe some people will 4  their houses on other planets.

    Sarah: Students in the future won't need to go to school and they will study at home. What will happen  5 students have problems with a subject? They will  6with a teacher through videoconferencing (视频会议).

    Peter: In the future, people will speak fewer languages. Maybe there will be  7one language in the world. And it will be much  8 for people to talk with each other.

    Laura: Robots will play an important role in our life. 9will help humans do all kinds of work.

    These predictions may seem impossible today, but I10 they will come true one day because we never know what will happen in the future.

我们生活在声音的世界里。下列声音：（1）工厂车间里机器的轰鸣声；（2）剧场里京剧表演的演奏声；（3）清晨公园里小鸟的鸣声；（4）装修房子时的电钻声；（5）婚庆时的爆竹声；（6）山涧小溪潺潺的流水声，其中属于噪音的是（   ）