题目

While we may think it feels good to complain, complaining has some bad effects associated with it.Why isn't complaining beneficial? Research shows that it connects our brain with negativity. The brain is designed to work efficiently. This means that when we repeat a thought, negative or positive, the nerve cells form a bridge between each other to pass information in a higher speed. Therefore, the next time we have a similar type of thought, it is more easily passed. This explains why certain thought patterns become habits.Yet the harmful effects don't stop there. A study shows that complainin质量相等的水、铝块、铜块和水银（c水＞c铝＞c铜＞c水银），它们的温度分别从20℃降低到10℃，放出热量最多的是（　　） A、水B、铝块C、铜块D、水银