Last September, the U.S. government announced that its birthrate fell to "another record low". Morally speaking, there’s nothin

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问题     Last September, the U.S. government announced that its birthrate fell to  "another record low". Morally speaking, there’s nothing wrong with this. It’s【C1】________in a way. All over the world, birthrates tend to fall a-long with economic development
    The thing about an increasingly childless economy is that it has major implications for【C2】________. It is confirmed by a new data from a Gallup survey【C3】________on the average daily spending of families. Even after you control for income, age, education, and【C4】________status, families with young kids spend more every day.
    What are parents spending on? Not just books, toys, and games. The Department of Agriculture【C5】________surveys the many ways we spend on our kids, to the tune of about $14,000 a year. The【C6】________majority of money goes to the【C7】________: housing, food, transportation, and education. Housing is kind of funny, because young children tend not to have their housing units,【C8】________the parents are extremely well-off and the children are terribly misbehaved. The survey estimates the housing portion of spending by trying to【C9】________a few factors: the cost of an extra bedroom, the cost of moving into safer【C10】________with better schools, and the cost of buying homes with larger yards.
    It is【C11】________that on economic growth, some of the most discussed variables on editorial pages and cable news are policy choices like tax rates or international events. But buried【C12】________these headlines is the glacier of demographics, the steady and unyielding force of human numbers to【C13】________the economy. The【C14】________in U.S. birthrates in recent years has almost certainly had a negative effect on consumer spending (and【C15】________, lower birthrates are probably an outcome of the recession). In particular, childless couples don’t need space for more kids so they’re less【C16】________to buy homes in the suburbs,【C17】________demand for housing that badly needs to sell more homes. In other words,【C18】________families and less household formation【C19】________the U.S. economy of housing and transportation spending, which has historically accounted for half of family【C20】________.
【C9】

选项 A、account for
B、abide by
C、answer to
D、back up

答案A

解析 a few factors后的冒号表明下文即factors所指内容。这些都是父母在住房上花钱的原因,因此A项account for“解释;说明”符号语义要求。B项abide by“遵守,履行”,住往指接受某个规则或决定,但冒号后所及的内容并不能算作是规律。C项answer to“回应,有责任(向某人)(就某事)作出解释”,可表示解释,但常用于解释做的不对的事情。D项back up“支持”也不符合上下文语义。
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