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  3. Fifty volunteers were alphabetically divided into two equal groups, Group A to participate in a 7 weeks exercise program, and Gr

Fifty volunteers were alphabetically divided into two equal groups, Group A to participate in a 7 weeks exercise program, and Gr

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问题     Fifty volunteers were alphabetically divided into two equal groups, Group A to participate in a 7 weeks exercise program, and Group B to avoid deliberate exercise of any sort during those 7 weeks. On the day before the exercise program began, all 50 men participated in a step-test. This consisted of stepping up and down on a 16-inch bench at 30 steps a minute for 5 minutes.
    One minute after completion of the step-test, the pulse rate of each subject was taken and recorded. This served as the pretest for the experiment. For the next 7 weeks, subjects in the experimental group (Group A) rode an Exercycle (a motor-driven bicycle-type exercise machine) for 15 minutes each day. The exercise schedule called for riders to ride relaxed during the first day’s ride, merely holding on to the handle bars and foot pedals as the machine moved. Then, for the next 3 days, they rode relaxed for 50 seconds of each minute, and pushed, pulled, and pedaled actively for 10 seconds of each minute. The ratio of active riding was increased every few days, so that by the third week it was half of each minute, and by the seventh week the riders were performing 15 solid minutes of active riding.
    At the end of the 7 weeks, the step-test was again given to both groups of subjects, and their pulses taken. The post-exercise pulse rates of subjects in the experimental group were found to have decreased an average of 30 heart beats per minute, with the lowest decrease 28 and the highest decrease 46. The pulse rates of subjects in the control group remained the same or changed no more than 4 beats, with an average difference between the initial and final tests of zero.
This passage implies that______.
选项 A、most people do not get enough exercise
B、a high pulse rate is desirable
C、regular exercise can strengthen your heart
D、everyone should exercise 15 minutes a day
答案C
解析 从题中“implies”一词我们可以判断出此题为推断题。解答推断题的关键是弄清作者说了些什么，作者的写作目的是什么，文章的主题是什么。在阅读时，应注意作者表达态度、观点、感情方面的措辞是什么，注意作者的语气怎样。总之，要在认真领会原文基础上结合主题来推断。文中第一段第四句说：“一分钟的踏步实验完成后，每个实验者的脉搏都被测出并记录下来。”结合第二段中对A组实验对象的最后测试结果，我们可以看到，通过为期七周的训练，A组成员的脉搏跳动率下降了。根据医学常识我们可知，这意味着A组成员的心脏功能增强了。所以在本文中，作者提倡锻炼身体强健心脏。故选项C正确。选项A“大多数人缺乏锻炼”；选项B“脉搏越快越好”；选项D“每人每天应锻炼15分钟”；这些内容作者在文中未提及或存在观点上的错误。
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