题目

Women have jumped ahead of men for the first time in using the Internet to do their holiday shopping,according to a study published last week in the US. For years men have been more likely to shop on the Internet than women,but during the 2011 holiday season 58 percent of those making online purchases（购买）were women. “It shows how mainstream the Internet is becoming”,said Lee Rainie,director of the Pew Internet and American Life Project group,which carried out the study. Rainie said it was only a matter of time before women shoppers caught up with men.This is because women tr弹簧振子在光滑的水平面上做简谐运动，在振子向着平衡位置运动的过程中(    )A．振子所受的回复力逐渐增大B．振子离开平衡位置的位移逐渐增大C．振子的速度逐渐增大D．振子的加速度逐渐增大