科學(xué)60秒:美國少女媽媽數(shù)量下降

Hints：In 2010 there were 34.3 births among every thousand girls between the ages of 15 and 19. That’s down 9 percent from 2009. And it’s the lowest number in nearly seven decades of reporting....

社會(huì)：紐約公共交通加強(qiáng)安全戒備

Hints：Michael BloombergThe New York police department says there has been no specific threat against the city’s subway system, but additional security has been put in place as a precaution. The

美國救市提案被否決(1)

hints: John BoehnerWhen the final vote was announced, the measure had gone down in defeat, with 133 Republicans and 95 Democrats voting against it. Afterwards, as lawmakers and Americans nervousl...