题目

Far from the traditional image of a culture of aggressive masculinity (阳刚) in which students either sink or swim, the absence of girls gives boys the chance to develop without pressure to conform (符合) to a stereotype, a US study says. Boys at single-sex schools were said to be more likely to get involved in cultural and artistic activities that helped develop their emotional expressiveness, rather than feeling they had to conform to the “boy code” of hiding their emotions to be a “real man”. The findings of the study go against received wisdom that boys do better when tau如图，在直角坐标系中放置一个边长为的正方形ABCD，将正方形ABCD沿x轴的正方向无滑动的在x轴上滚动，当点A第三次回到x 轴上时，点A运动的路线与x轴围成的图形的面积和为 …（ ）A． B． C． D．