题目

某校化学兴趣小组利用数字化传感器探究稀盐酸和氢氧化钠溶液的反应过程，测得烧杯中溶液的 pH 随滴加液体体积变化的曲线如图所示。下列说法正确的是( ) A．图中a点所示溶液中，含有的溶质是NaCl和NaOH B．由a点到b点的pH变化过程证明酸和碱发生了中和反应 C．向图中c点所示溶液中滴加无色酚酞，溶液不变色 D．该实验是将盐酸逐滴滴入到盛有氢氧化钠溶液的烧杯中All big cities are quite similar. Living in a modern Asian city isn’t very different from living in an American city. 小题1:______ In many parts of the world, farmers and their families live in villages or towns. In the United States, however, each farm family lives on its own fields, often beyond (在……之外) the sight of any neighbors. Instead of traveling from the village to the fields every morning, American farmers stay on their land the whole week. 小题2:______ Their children ride on buses to large schools for all the farm families living in the area. In some areas, there are small schools serving a few farm families, and the children walk to school. Of course life keeps changing for everyone, including farmers. 小题3:______ And there are also modern machines for farming. All of these have changed the farm life. 小题4:______ Farmers usually had to deal with their own problems, instead of getting help from others. They learned to try new ways, and to trust their own ideas rather than (而不) followed the old ways.*******************************************************************************A. Today there are cars, good roads, radios and television sets.B. The same can not be said about living on farms, however.C. Many years ago, however, farming in America was often a lonely way of living.D. They travel to the nearest town on Saturdays for shopping or on Sundays for church.小题5: Which of the following is NOT true according to the passage?A．Life in the world also keeps changing.B．Life in the United States keeps changing.C．American farmers like their old ways.D．American farmers have changed their lives.