Mary often does some translation work to earn extra money,which_____half of her income.[ ]

A. accounts for  

B. makes for

C. allows for  

D. cares for

今日之重庆，是中国四大直辖市之一，地域广阔，人口众多。其东西长约（）公里，南北长约（）公里，总面积达（）万平方公里。