在探究实验“光对鼠妇生活的影响”中，作为实验中的变量的是（　　）

    Mary is an American girl. She is now in Beijing with her parents. Mary doesn't know much Chinese, but she is studying it. She often speaks Chinese with her Chinese friends. Sometimes they can't understand her, because she can't speak Chinese very well.

    It's Saturday morning. She goes out. She is walking in the street. She wants to go to the zoo to see the elephants and monkeys, but she doesn't know how to get there. She asks a Chinese boy the way. The boy can't understand her. Then she takes out a pen and a piece of paper. She draws an elephant on it, and shows the picture to the boy. The boy understands, and shows her the way to the zoo.

本次会议将批准《2017－2021年上合组织进一步推动项目合作的措施清单》，涵盖贸易、投资、海关、农业等7大领域的38项措施，将对上合组织今后5年的务实合作发挥引领作用。材料说明（   ）

①当代国际竞争实质是综合国力的较量　②国际关系健康发展需协调国家间利益　③维护共同利益是我国外交政策的宗旨　④国际关系实质上是一种利益关系

（Ⅰ）求a，b，c的值；

（Ⅱ）用分层抽样的方法，从评定等级为“合格”和“不合格”的学生中随机抽取10人进行座谈．现再从这10人这任选4人，记所选4人的量化总分为ξ，求ξ的分布列及数学期望E（ξ）；

（Ⅲ）某评估机构以指标M（M= $\frac{E\left(\xi \right)}{D\left(\xi \right)}$ ，其中D（ξ）表示ξ的方差）来评估该校安全教育活动的成效．若M≥0.7，则认定教育活动是有效的；否则认定教育活动五校，应调整安全教育方案．在（Ⅱ）的条件下，判断该校是否应调整安全教育方案？