When income increases, purchases of houses increase. This means
A. a. the demand curve for housing has shifted rightward.
B. b. there has been a movement down the demand curve for housing.
C. c. the demand curve for housing has shifted leftward.
D. d. there has been a movement up the demand curve for housing.
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选择合适的字填空。园 元 圆花( )______ ( )旦______ ( )桌______
( ),凌寒独自开。______ 白日依山尽,( )。______
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