在现代社会经济条件下，有两种基本的资源配置方式——计划和市场。下列选项能体现市场作为资源配置方式的是（    ）

有一种固体混合物质M，其中只可能含有Na₂CO₃、NaNO₃、Na₂SO₄、CuCl₂、BaCl₂中的一种或几种．请根据以下实验操作回答下列问题．

操作①取少量M放入足量的水中充分搅拌、静置，得到白色沉淀和无色溶液，过滤．操作②向滤出的沉淀中加入足量稀盐酸，沉淀全部溶解，此时所得溶液仍为无色．

    Hi! Welcome to my webpage. My name's Tom Wood and I'm an English teacher. I ____ (design) this webpage last week so that my students can learn more about me. I think it is important____ (know) my students well. And it is only fair____ my students know me well, too.

    I was born in London, England, but I've lived and worked in China for the past 15 years and I really like living here.

    I can speak Putonghua and even a little bit of Cantonese____ is my wife's dialect (方言). I practice____(speak) Chinese every day and I am improving____(fortunate), there are one or two million people in my town who are ready to help me with my Chinese! I particularly enjoy talking to my neighbors.

    My favourite sport is football. I play football once a week with some of the other teachers at the school. We're going to organize a(n)____ (compete) with teams of teachers from other schools this summer.

    My other great love is my motorbike. I love getting on my motorbike and riding out to the countryside. But my wife thinks it's too____ (noise )and dangerous. If anyone wants to send me an email, just____do) as you like. I'd love to hear____ you.

唐朝政府同以前历代统治者“贵中华，贱夷狄”的做法不同，采取“抚九族以仁”的政策，说明唐朝（    ）