Nowadays，it is common to see 5-gallon bottles of water being sent to homes. Supermarket shelves are filled with all kinds of bottled water from simple plastic bottles containing “pure spring water” to expensive foreign types of mineral water in glass bottles. In Europe，bottled water is as popular as soft drinks are in the USA．People are not only interested in the different choices of drinks，but also in the taste of bottled water and its health value.
All bottled water must list the content of the water on the bottle. Some companies mix minerals together to give the water a better taste．But the term mineral water is misleading， because an water―except specially purified water―contains minerals. Law must be made to tell people clearly what kind of water people are exactly buying：spring water, mineral water, or purified water．For example，“spring water” will have to come from the underground spring.
Many people choose bottled water over tap water，because they doubt the safety of public drinking water．Some people worry about city water supplies．We need to pay close attention to the cleanliness of our drinking water．The government should be responsible for tap water quality. It should be tested and checked regularly．
Keep in mind that bottled water is expensive．In many rases，you are paying for water that is not much different from tap water．If you are not sure of the safety of your tap watter，have it tested．A local health department can be of service．Compared with the cost of bottled water，the testing cost will be less expensive．Letting cold water run for a minute or so before taking a drink or using it in preparing a meal is a good way to limit possible water pollution, especially if the water has been off for an hour or more．
56．What is the best title of the passage? (No more than 10 words)
57．According to the passage，what kind of water doesn't contain minerals? (No more than 5 words)
58．Why do people prefer bottled water to tap water? (No more than 10 words)
59．Please explain the underlined phrase“keep in mind”in English． (No more than 5 words)
60．If you don't think tap water is safe enough，what can you do? (No more than 20 words)