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【单选题】
城市各项活动的外部性经济效果总量在城市地域中( )，而在城市外围则( )，这种空间上的序列变化体现为城市土地的级差效益。
A.
向心递减；逐渐增强
B.
向心递增；逐渐增强
C.
向心递减；逐渐减弱
D.
向心递增；逐渐减弱
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