某校4位同学在体育测试时，分别准备了补充能量的物质：甲-糖；乙-牛肉干；丙-水果；丁-蛋糕。哪位同学准备的食物能更快地补充能量？（ ）
A．甲
B．乙
C．丙
D．丁
答案：A
题目分析：A.甲是糖类，糖类是人体最重要的供能物质，是补充能量最快的食物；故A正确；
B.乙-牛肉干含有丰富的蛋白质，蛋白质是构成人体细胞的基本物质，而不是主要能源物质；故B错误；C.水果能够为人体提供维生素和无机盐，不能提供能量，故C错误；D.蛋糕虽含有丰富的能源物质---糖类，但需要在消化道内被消化成葡萄糖后，人体才能吸收利用；补充能量慢，故D错误。故选：A
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| Which Method Do You Think Better? By the time that a student reaches his senior year in high school, he is likely to believe that he is an expert in reading. No matter how 1 he is, he can still improve. How do you read an article in a textbook? Do you have a certain 2 of doing it or do you just 3 at the beginning and keep reading 4 you come to the end? 5 students say that they use the " slow and sure" method. By this they mean they read every sentence slowly and 6 . Every time they come to an 7 word they stop 8 what it means and, if necessary, look it up in the 9 . In this method a person 10 has no time left for 11 what he has read, for he has used all his 12 in trying to get the meaning of each word to 13 that he 14 everything. Other students use what has been 15 the "review" method. Here a person tries to arrange his time 16 he can read his lesson 17 twice. This type of reading is 18 than the " slow and sure" method, for the lesson 19 be read rapidly or there will not be 20 time left for a second reading. | |||
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