已知葡萄糖的结构简式为CH2OH(CHOH)4CHO,由此判断下列关于葡萄糖性质的叙述中不正确的是( )。
A．葡萄糖能发生酯化反应
B．葡萄糖具有还原性
C．葡萄糖充分燃烧的产物为CO2与H2O
D．完全燃烧等质量的葡萄糖和甲醛,所需氧气物质的量不相同
答案：D
由于葡萄糖分子中有—OH,故其具有醇的性质,能发生酯化反应,而且具有还原性,A、B两项均正确;葡萄糖完全燃烧的产物为CO2和H2O,C项正确;葡萄糖、甲醛两者的实验式相同,完全燃烧等质量的葡萄糖和甲醛时,其耗氧量相等。
| 阅读下列短文，从每小题所给的四个选项（A、B、C和D）中，选出最佳选项。 |
| One of the most surprising things about football in England is the great knowledge of the game which even the smallest schoolboy seems to have. He can tell you the names of players in most of the important teams. He has pictures of them and knows the results of large numbers of matches. He will tell you who he expects to win such and such a match, and his opinion is usually as good as that of men three of four times his age. Most schools in England take football seriously — much more seriously than nearly all European schools, where lessons are all that are important, and games are left for the children themselves. In England, it is believed that education is not only a matter of filling a boy's mind with facts in the classroom, education also means the training of character, and one of the best ways of training character is by means of games, especially team games, where the boy or girl has to learn to work with others for his team, instead of working for himself alone. The school, therefore, plans games and matches for its pupils. Football is a good team game, good both for the body and the mind. That is why it is every school's game in England. |
| 1. In England schoolboys seem to . |
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| A. know a great deal about football games B. learn football in class C. know all the result of football matches D. work together in football teams |
| 2. In England a boy's opinion of a match is often . |
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| A. three or four times better than that of grown men B. worse than that grown men C. as good as that of grown men D. worth considering three or four times |
| 3. In almost all European schools, lessons are . |
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| A. left for the children themselves B. what the children like best C. as important as football games D. considered the most important |
| 4. In England education means . |
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| A. filling children's mind with stories B. more than the teaching of knowledge C. the teaching of lessons only D. training character by means of football games |