题目

听材料，回答问题。 （1） What problem do people often have according to the speaker? A . They waste a lot of time. B . They're too busy to enjoy life. C . They don't want to take exercise. （2） What sport did Travis like best in the past? A . Walking. B . Swimming. C . Running. （3） What does the speaker suggest doing in preparation? A . Getting up earlier. B . Taking a quick shower. C . Having a good breakfast. （4） Why does the speaker give the talk? A . To sell walking shoes. B . To suggest saving time. C . To tell a healthy盐酸与块状碳酸钙固体反应时，不能使反应的最初速率明显加快的是（　　）A．将块状碳酸钙固体换成粉末状固体B．盐酸的量增加一倍C．盐酸的用量减半浓度加倍D．温度升高40°C