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高中英语完形According to the report , the picture of the earth in

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高中英语完形
According to the report , the picture of the earth in the year 2010 is not a pleasant one. The world will be more crowded because the population will continue to grow. The population could be as large as 6300 million, almost 2, 150 million more than in 1985. More people would move into cities , especially cities in development countries. Cities like Cairo and Jakarta probably would ______ have 15 million by then.
A .each B.all
答案是A,
B为什么不行啊
因为只提到了两个城市,而且强调的意思是“各自拥有”,所以用each.