areas are filled with educated people. 可知没有确凿的原因，但是末段提到Increased urbanization isn't the only reason car- eschewing cities see smarter citizens. Young people play a role, too.所以可能的原因就在于城镇化和年轻一代，故正确选项为C。35. What the positive roles played by young people? (
AThey put forward proposals for using pubic transportation rather than private cars.
BThey realize their parents' dream of moving to cities.
CTheir workforce leads to cities with higher GDP and educational levels.
DThey contribute to cities’ educational industry.