单项选择题 According to the passage" about US $ 116 billion are required to give minimum comfort to these people by the turn of the century--less than US $ 10 billion per year", do you think which year was the article written

单项选择题 If the urban popluation of the developing countries exceeds 2 billion people by the year 2000, the additional people will face the problem of ______.

单项选择题 This passage assumed the desirability of ______.