题目

任务型阅读 阅读下面短文，根据短文内容完成句子。Do some colors make you feel calm while others give you energy? Scientists have studied the connection between color and mood（心情）for a long time. Many believe that color can influence our moods.Warm, bright colors such as yellow and red are positive colors. They can give people a pleasant feeling. Cool colors such as blue, purple, and green are relaxing colors. They help people experience calm feelings.Many public places are decorated（装饰）with certain colors in order to create certain moods. Orange make某主族元素R的最高正价与最低负化合价的代数和为4，由此可以判断( )A. R一定是第四周期元素B. R一定是ⅣA族元素C. R的气态氢化物比同族其他元素气态氢化物稳定D. R气态氢化物化学式为H2R