pH=3的醋酸和pH=11的氢氧化钠溶液等体积混合后溶液呈 ____，溶液中c（Na⁺） ____c（CH₃COO^﹣）．

2007年12月，我国考古工作者在南宋古沉船“南海一号”中打捞出部分青瓷和白瓷。出水时瓷器釉色清亮，仿佛新出窑一般。据此形成的以下认识，符合历史事实的是

    I will have a holiday next week and I can't decide what to do. I have a lot of work to do 1 and this would be a good chance 2. But I don't like 3 the holiday in such a way.I can work at home all the rest of the year.

    Last year I went 4 to the mountains. 5 there was beautiful， but it is too cold this time of a year. And it's really6 far to go for a short holiday. I decide 7 this isn't a good time to8the mountains.But I9to go somewhere else.Perhaps this would be a good chance to go to the beach（海滨）.I like to go for walks10the seashore 11the warm sunshine and watch the water. It's only eight miles away and I could get there 12about two hours. After thinking it13，I am sure that this is a 14time for the seashore than15.

    Oh， here is a 16from Jim. He 17 he is going to his house in the mountains for the18，and he19me to go with him.20 giving it some more thought， I wrote back to Jim and thanked him for that.

根据短文理解，选择正确答案。

    If you could have one superpower, What would it be ?

    Dreaming about whether you would want to read minds , see through walls , or have superhuman strength may sound silly , but it actually gets to the heart of what really matters in your life 1

    Every day in our work , we are inspired by the people we meet doing extraordinary things to improve the world.

    They have a different kind of superpower that all of us possess : the power to make a difference in the lives of others .

    We're not saying that everyone needs to contribute their lives to the poor . Your lives are busy enough doing homework , playing sports , making friends , seeking after your dreams . But we do think that you can live a more powerful life when you devote some of your time and energy to something much larger than yourself . Find an issue you are interested in and learn more . Volunteer or , if you can , contribute a little money to a cause . Whatever you do , don't be a bystander . Get involved . You may have the opportunity to make your biggest difference when you're older . But why not start now ?

    Our own experience working together on health , development , and energy the last twenty years has been one of the most rewarding parts of our lives . It has changed who we are and continues to fuel our optimism about how much the lives of the poorest people will improve in the years ahead .