【单选题】
A <{p}>By starting more large farms in the center of cities.<{br/}><{/p}>
B <{p}>By building more high-density buildings in city centers.<{/p}>
C <{p}>By tearing down high-density builing in city centers<{/p}>
D <{p}>By using unused open spaces in residential areas in cities.<{br/}><{/p}>
查看更多
