题目

室温时，随着向盛有稀硫酸的烧杯中逐滴加入Ba(OH)2溶液，烧杯内溶液中的溶质质量变化如图所示(忽略溶液温度的变化)，下列分析正确的是A．a点溶液中只有一种溶质B．b点溶液中滴加紫色石蕊溶液，溶液变蓝C．d点溶液中有较多的Ba2＋、OH－、SO42-、H＋D．c点烧杯内液体的pH(选填“大于”“等于”或“小于”)7People who like travelling have their reasons.They believe that travelling can help them expand their field of view，especially in the geographical and historical sense.They also think that touring will give them more chances to enjoy different kinds of food and experience new things  that would never be  brought by other activities.But those who dislike travelling also have some reasons. Travelling，in my opinion，does more good than  harm.Most importantly，it broadens (使扩大) our mind.We can get in touch with other civilizations (文明)，cultures，customs and ideas. Through history，most people travelled because of necessity (必要性)—not for pleasure.People travelled just in order to remain alive.They searched for food to eat or places to live in.They sometimes ran away from enemies.This is not to say that no one ever travelled just for the fun of it.In ancient times，for  example，rich Romans travelled all the way to Greece to take part in the Olympic Games，and festivals.Of course，some people decided to travel just out of curiosity (好奇心)．They wanted to find out what it looked like beyond the horizon  (地平线)．Also business travel has been going on for centuries.Traders could not only make money but also learn to speak several languages and be introduced to different cultures. So，travelling does enrich our mind and draw new ideas to us.There is no doubt that we can get much from it. 58．The underlined word “expand” in Paragraph 1 can be replaced by “________”． A．widen                                                B．protect   C．lose                                                   D．decide 59．According to the passage，in the past most people travelled________. A．for fun                                              B．for knowledge C．to get experiences                               D．to make a living 60．What’s the main idea of this passage? A．Different kinds of travelling. B．Travelling enriches our mind. C．Ways to enjoy yourself while travelling. D．The advantages and disadvantages of travelling.