问题
单项选择题
关于碘的性质描述哪种是不准确的
A．一种活泼的非金属元素
B．在地壳中含量稀少
C．在海水中含量较多
D．在自然界中迁移循环
E．人体需要量较大
答案
参考答案：E
解析：碘是人体必需的微量元素，其摄入量不足则会对健康造成危害。
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关于碘的性质描述哪种是不准确的
A．一种活泼的非金属元素
B．在地壳中含量稀少
C．在海水中含量较多
D．在自然界中迁移循环
E．人体需要量较大
参考答案：E
解析：碘是人体必需的微量元素，其摄入量不足则会对健康造成危害。
Every country had its heroes. The heroes are the people that nation and especially the young people 21_____ . If you get a list of the 22 _____of a nation, it will tell you the potential (潜力）of the nation. If today in America ’ you ask the high school students to list their heroes their 23____ would probably divide into three groups. rHie first group of heroes would be the rock stars—the people 24 _____with rock music. There is no doubt that such people do have talent (天才）but one 25_____ if one should hold up rock stars as model. The rock stars too often are mixed with drugs and their personal life isnot all that — 26 ____ . The rock stars are rich and wear the latest fashion styles (时装）.However oneshould 27 _____more in a hero than such things as 28______ and fine clothes. A second type of heroes for the American youth are sports stars. Again you have a person who has a great talent in one area_ 29 _____. However, too often the personal life of the sports star is a bit 30_____. Too frequently drugs and drinking are a part of 31_____ of the sports stars. A third group of heroes are TV or movie stars. These people may have lots of 32___ ，talent and are quite handsome. However ’ the personal life of too many actors is quite sad and should not be held up as a 33____ for young people. Today，the rock stars，the sportsmen and the actors 34____ have become the models of the youth in America. Really,do you hear a young person say that his 35____ is a doctor, a teacher or a scientist? These people are not 36____ and do not wear fashionable clothes. However, they are 37____ people who work hard to make the world a better place for everyone. What is really sad is that the young try to 38____ their heroes. They like to wear the same clothes as theirs, if the heroes of today for the American youth are 39 ____only to rock stars, sportsmen and actors, the future does not look too 40_____ .
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