单项选择题
A. Spending too much money on the customers. B. Finding no available conference room in Shangri-la. C. Too many customers coming to attend the meeting. D. Few customers going to see ice sculptures and buildings.
A. warn people against the population explosion in the near future B. compare the demographic growth pattern in the past with that after 1650 C. find out the cause for rapid increase in population in recent years D.present us a clear and complete picture of the demographic growth