题目

From encouraging schoolwork and sports to modeling values as a child grows, parents have great influences on their children’s lives. They are, however, not the only influences—especially after children enter school. While parents may want to lead their child along a certain path, a parents’ job is to prepare a child for independence and the ability to achieve what they choose.To parent effectively, it’s not enough to simply avoid the obvious dangers like abuse, neglect. Indeed, the National Academy of Sciences delineates four major responsibilities for parents: maintaining children’s 下图是某地某段时间内气温和气压的变化曲线，该地在这段时间内经历为 [　　] A．快行冷锋 B．慢行冷锋 C．暖锋 D．准静止锋