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  3. America has seen a drop in crime rates that in earlier years would have been universally viewed as impossible. The overall crime

America has seen a drop in crime rates that in earlier years would have been universally viewed as impossible. The overall crime

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问题     America has seen a drop in crime rates that in earlier years would have been universally viewed as impossible. The overall crime rate has plummeted by 45% since peaking in 1991 and by 13% just since 2007—counterintuitively continuing to drop through the recession and sharp spike in unemployment.
    Since 1991, according to FBI data, the number of violent crimes has fallen 36% nationally and 64% in the nation’s largest cities. And in New York and Los Angeles, the nation’s two largest cities , it has fallen even further. Property crime has also become increasingly rare. Incredibly, in New York City, car thefts have plunged 94% in the past two decades.
    How is this possible? In the mid-1990s, few saw this decline coming, and many warned that crime would surge once again as teens of that era grew into young adults. Today, criminologists still differ on what has caused the nationwide turnaround in crime rates and why those dire predictions never came to pass. But crime-fighting technology, better policing, aging societies, growing urban populations and declining usage of hard drugs are widely cited. For many Americans, the drop in crime has resulted not only in a much higher quality of life but in a reduced economic burden as well. Safer cities generally mean stronger urban economies.
    In the same category of big surprises, teen-pregnancy rates have fallen to their lowest level in more than 30 years, according to the widely respected Guttmacher Institute. They have declined 51% from their 1990 peak, based on the latest available data, and the teenage birthrate is down 43% from that year’s level. Today, fewer teens are becoming pregnant and becoming mothers than at any point since reliable data has been collected by the National Center for Health Statistics. This is also true for women in the 20-to-24 age group. To put it mildly, there were very few predictions to this effect a generation ago. In addition, overall birthrates in the U. S. have turned up for the first time since 2007—including for children born to women in a college education—to just shy of 4 million.
What can we infer from the last paragraph?
选项 A、Birthrates, including for children born to college girls, are slipping all the time.
B、Few people have predicted the drop of teen-pregnancy rates a generation ago.
C、Based on the latest available data, teen-pregnancy rates have dropped 43 % .
D、Fewer women above 24 become pregnant than a generation ago.
答案B
解析 [A]项对应最后一句：In addition，overall birthrates in the U．S．have turned up forthe first time since 2007—including for children born to women in a college education--to just shy of4 million．关键词是turned up，即上升的意思，而非下滑，故该项错误。[B]项对应倒数第二句：To put it mildly，there were very few predictions to this effect a generation ago．其中this effect指代上文提到的“年轻女孩的怀孕率和生育率下降了”，故该项正确。[C]项属于偷换概念。原文说的下降43％的是teenage birthrate(青少年生育率)，而非该项说的teen-pregnancy rates(青少年怀孕率)，故该项错误。[D]项对应倒数第三句：This is also true for women in the 20-to-24 age group．原文并未提到任何关于women above 24(24岁以上女性)的内容，故该项属于无中生有。
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