题目

Forgiving(原谅) someone who has hurt you or let you down is never an easy thing. Several new studies, however, say that it could have a lot of health benefits. When you think of forgiveness, you probably don’t think of it as being a health or medical problem. Studies from Stanford University, on the other hand, show that something like anger(愤怒) can change your well-being. When cartoon book characters like the Incredible Hulk get angry, they change colors and often gain special power. In the real world, anger is less obvious and may be more dangerous. That’s why Professor Fre探究“光对鼠妇生活的影响”实验中的实验变量是 A.光照        B.湿度          C.温度           D.空气