问题
选择题
具有漂白作用的物质有：①次氯酸 ②二氧化硫 ③活性炭 ④过氧化钠，其漂白原理相同的是[ ]
A．①③
B．②③
C．①④
D．②④
答案
答案：C
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具有漂白作用的物质有：①次氯酸 ②二氧化硫 ③活性炭 ④过氧化钠，其漂白原理相同的是[ ]
A．①③
B．②③
C．①④
D．②④
答案：C
We all laugh. We all hurt. We all make mistakes. We all dream, that’s life. It’s a journey. Please follow these rules to make the journey of your life a journey of joy! positive through the cold season could be your best against getting ill, new study findings suggest. In an experiment that healthy volunteers to a cold or flu virus, researchers found that people with a sunny characteristic were less likely to ill. The findings, published in the journal Psychosomatic Medicine, build on evidence that a “positive emotional style” can help the common cold and other illnesses. Researchers believe the reasons may be both objective as in happiness increasing immune(免疫的) function and subjective as in happy people being less by a scratchy throat or runny nose. “People with a positive emotional style may have different immune to the virus,” explained the lead study author Dr Sheldon Cohen of Carnegie Mellon University in Pittsburgh. “And when they do get a cold, they may their illness as being less severe.” Cohen and his colleagues had found in a study that happier people seemed less likely to catch a cold, but some questions remained as to whether the emotional tendency itself had the effect. For the new study, the researchers had 193 healthy adults with complete standard measures of personality tendency, health-consciousness and emotional “style”. Those who be happy, energetic and easy-going were judged as having a positive emotional style, those who were often unhappy, tense and unfriendly had a negative style. The researchers gave them drops through their noses either a cold virus or a particular flu virus. Over the next six days, the reported on any aches, pains, sneezing they had, while the researchers collected data, like daily mucus(黏液) production. Cohen and his colleagues found that based on objective measures of nasal woes(鼻部的不适), happy people were less likely to develop a cold.
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