单项选择题A.To demonstrate the importance of public health laws.B.To point out that without luck businesses will not succeed.C.To explain how traveling led to new inventions.D.To illustrate the importance of having the right product at the right time.
单项选择题A.They drank from public water fountains.B.They passed around a cup of water.C.They drank from personal tin cups that they earried with them.D.They bought a paper cup of water.