题目

Rupert Isaacson was born in Africa, and grew up in London and in the English countryside, where he discovered his love of horses. Because he grew up hearing so many fascinating memories about Africa from his parents, he went there and lived with the people called The Bushmen of the Kalahari Desert.By the year 2000, Rupert was already working as a reporter, writing articles and guidebooks about Africa and India. He met his wife Kristin in India. Today, they live with their son, Rowan, in the US. But Rupert faced the greatest challenge of his life when, at the age of two, Rowan was diagnosed (为研究影响家用保温瓶保温效果的因素，某同学在保温瓶中灌入热水，现测量初始水温，经过一段时间后再测量末态水温．改变实验条件，先后共做了6次实验，实验数据记录如下表： 序号 瓶内水量/mL 初始水温/℃ 时间/h 末态水温/℃ 1 1000 91 4 78 2 1000 98 8 74 3 1500 91 4 80 4 1500 98 10 75 5 2000 91 4 82 6 2000 98 12 77下列研究方案中符合控制变量方法的是AA．（A）若研究瓶内水量与保温效果的关系，可用第1、3、5次实验数据（B）若研究瓶内水量与保温效果的关系，可用第2、4、6次实验数据（C）若研究初始水温与保温效果的关系，可用第1、2、3次实验数据（D）若研究保温时间与保温效果的关系，可用第4、5、6次实验数据．