On the other hand, it is often pointed out that once sustainability limits are near or are reached, there are decreasing productivity gains , and people become a cost rather than an asset. If we assume that there are sustainability limits and that we are close to reaching these limits at a world level, then it is appropriate to check population growth.

　　21. According to the passage, the population argument is focused on_______.

　　A. whether more people are a property or a cost

　　B. whether Mexico should control its population growth or not

　　C. whether the density of population in Mexico is large or small

　　D. what the standard international sustainability limit is

　　22. Which of the following is TRUE according to the first paragraph?

　　A. Mexico has stepped into an aging society.

　　B. It is not necessary for Mexico to control its population.

　　C. Mexico population is younger than that of developed countries.

　　D. It is not necessary for Mexico to develop its infrastructure.

　　23. By infrastructure the author means_______.

　　A. buildings

　　B. the basic framework of a country, such as schools, services, etc.

　　C. social demands

　　D. services and production

　　24. It may be inferred from the 3rd paragraph that_______.

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