题目

According to body language expert Robert Phipps，the way people sleep at night actually determines a lot about the type of personality they have. Phipps has found out four sleeping positions that affect personality. Phipps found that worriers，those who stress the most，tend to sleep in the fetal (胎儿的) position. He found that this is the most common bedtime position，with nearly 58 percent of people sleeping on their side with knees up and head down. The more we curl up(蜷曲)，the more comfort we are seeking，according to Phipps. The second most common position is the log. S下列命题，属于假命题的是（　　）A．两条直线相交只有一个交点B．互补的两个角中至少有一个角是锐角C．三角形的内角和是180°D．平行四边形的对角线互相平分