单选题 The primary reason why the Constitution requires a census every ten years is to provide a basis for the apportionment (分配，分摊) of representative among the states.
【正确答案】 D
【答案解析】provide意为“供应，供给”，与supply意思相近。A意为“犯罪”；B意为“提出，呈现”；C意为“消耗，消费”。