What can we infer from the last paragraph? 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.
A.Birthrates, B. B．Few C. C．Based D. D．Fewer E.
【参考答案】
B [A]项对应最后一句：Inaddition，overallbirthratesintheU．S．havetu......