The common denominators of livable cities include
A) low population density, concentrated housing, few stores and businesses, wide highways, and abundant parking.
B) low population density, heterogeneous mixtures of residences and businesses, wide highways, and abundant parking for efficient transportation.
C) high population density, concentrated housing, limited business and stores, and a car-centered approach that makes driving easy.
D) high population density but heterogeneous mixtures of residences and businesses that encourage people to socially interact.
Question 2
Irrigation can result in the salinization of soils because
A) shortages of freshwater require the use of saltwater for irrigation.
B) salts are deposited on the soil surface as water evaporates.
C) the irrigation water washes away soil leaving behind concentrated salts.
D) many of the plants grown in these regions excrete salts into the soil.
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