TOEFL Reading: ETS-TOEFL阅读机经 - HA8OI6X7D44275H0L$

It can be inferred from paragraph 3 that wells on the nearby coastal region A. were smaller in size than the cisterns located in the city B. served as a water source for the growing number of cisterns in the city C. increased in number as the population density increased D. Provided enough water for only a relatively small number of people