题目

元素周期表中钠元素的信息如图所示，对图中信息理解错误的是（ ） A．质子数为11   B．核外电子数为22.99 C．元素符号为Na D．元素名称为钠 答案：【考点】元素周期表的特点及其应用． 【分析】根据元素周期表中的一个小格所提供的信息，一定要明确11、Na、钠、22.99所表示的含义，进行解答本题． 【解答】解：A、钠元素的质子数为11，故A正确； B、钠元素的相对原子质量为22.99，故B错误； C、钠元素的元素符号为Na，故C正确； D、元素名称为钠A four-year study of 200 college students found that those who drink heavily and started drinking at an early age demonstrate poor decision-making skills, just like long-term, chronic(长期的) alcoholics. Researchers at the University of Missouri-Columbia believe early onset binge drinking negatively affects psychological development. The researches examined college students between the ages of 18 and 22. After three years, they tested them using the Iowa Gambling Test, which measures the tendency to make immediate (disadvantageous) or long-term (advantageous) choices. Based on the students’ reported drinking habits, they were grouped into four categories: low binge drinkers, moderate binge drinkers, increasing binge drinkers and stable or high binge drinkers. “Students in the stable or high alcohol use category, who had longer histories of binge drinking, made riskier and less advantageous choices, which reflect problems associated with planning for the future,” the researchers reported. The study also found that only students who started binge drinking when they were younger showed impairment on the task. “There is reason to think that heavy binge drinking during adolescence, when the brain is still rapidly developing, may have some negative legacy (遗传) on psychological development,” said Kenneth J. Sher of MU’s Midwest Alcoholism Research Center in a news release. “The interesting thing is that if we were to just look at binge drinkers and how impaired they are in the decision-making process as juniors, we’d really be obscuring(使模糊) the important issue, which is how long they’ve been binge drinkers and / or how early they started.” 1.What does the passage mainly tell us? A．Four categories of heavy drinkers. B．Heavy drinking affects college students. C．Early onset binge drinkers are poor at decision-making. D．People drinking at an early age will develop into binge drinkers. 2.Which category would make the most disadvantageous choice? A．Low binge drinkers                      B．moderate binge drinkers C．Increasing binge drinkers                 D．Stable binge drinkers 3.Early onset binge drinking negatively affects psychological development because _______. A．adolescent students were not suitable for drinking B．drinking too much will slow the growth of the brain C．the brain has not fully developed during adolescence D．drinking will make the students make dangerous choices 4.What Kenneth J. Sher says suggests that _______. A．he is quite clear about what the important issue is B．if binger drinkers started late, there would be no bad effect C．the important issue is how impaired the students are in decision-making D．only early binge drinkers will have their decision-making ability affected