题目内容

一个人摄取的精炼糖和在消化过程中由食物分解成的糖就是进入人体血液的几乎所有葡萄糖(一种糖)的饮食来源。虽然咖啡在消化时自身不能分解成糖，但有时却能使人的血糖水平急剧上升，即使咖啡没有和奶油或任何甜食一起饮用。以下哪项如果正确，最有助于解释上文提到的咖啡对血糖水平的影响

A. 人们饮用咖啡经常是在饭后，每餐饭中含有的几种食物本身在消化过程中迅速分解成糖类。
B. 一小时内饮用2杯咖啡以上会增加人体的紧张程度，人体对此做出的反应就是把储存的葡萄糖释放到血液中。
C. 很少吃含有精炼糖食物的人的血糖含量比大量食用这种食物的人的血糖含量高。
D. 对许多人来说，吃一块巧克力蛋糕和喝一杯纯咖啡会同样使人兴奋。

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某国对吸烟情况进行了调查，结果表明，最近3年来，中学生吸烟人数在逐年下降。于是，调查组得出结论：吸烟的青少年人数在逐年减少。下述哪项如果为真，则调查组的结论受到怀疑

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A. 就一部作品未能反映社会现实的程度而言，这部作品是与文学相关的。
B. 想创作出一篇杰作的作家应避免被其他文学作品所影响。
C. 不具文学关联性的作品与其他作品之间不会有明显关系。
D. 过去的文学杰作被怀疑是关于过去社会现实的信息来源。