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  3. Last September, the U.S. government announced that its birthrate fell to "another record low". Morally speaking, there’s nothing

Last September, the U.S. government announced that its birthrate fell to "another record low". Morally speaking, there’s nothing

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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】______.
【C20】
选项 A、assets
B、events
C、troubles
D、expenditures
答案D
解析 空格所在句是非限制性定语从句，which在从句中作主语，指代主句中的housing and transportation spending(住房和交通上的开支)。因此，空格处需词是从句的宾语，应跟spending意义相关。D项expenditures意为“费用，开支”，符合语义要求。
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