In American there are more households(户主) with pets than with children.A. thoseB. theseC.

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(答案→)A. those
B. these
C. ones
D. that
解析：    
试题分析:考查不定代词。that指代不可数名词或特指的单数名词，ones代替泛指的单数名词，those代替特指的复数名词，而these无此用法。根据句意可知此处是households with pets和 households with children相比较，所以用不定代词those，故答案选A。句意：在美国家里有宠物的户主要比家里有孩子的户主多。