如图是甲、乙两种液体内部压强与深度关系的图像。设液体甲的密度为p_甲，液体乙的密度为p_乙，则p_甲和p_乙的关系是（   ）

    Today is Monday. It is sunny today. There is a sports meeting in our school. There are many students and players on the playground. Some basketball players are playing over there, and their classmates are watching. Some girls are running. There is a big tree on the playground. Some boys are jumping under the tree.

2015年，中国科学家屠呦呦因发现治疗疟疾的新疗法荣获诺贝尔医学奖。屠呦呦带领团队经过艰苦卓绝的努力并从《肘后备急方》等中医古典文献中获取灵感。《肘后备急方》的治疟验方：“青蒿一握，以水二升渍，绞去汁，尽服之。”但用传统的“熬汤”的方法无法取得治疟疗效，屠呦呦用低沸点的乙醚成功制取了青蒿提取物，开创了疟疾治疗新方法，全球数亿人因这种“中国神药”而受益。这表明（    ）