单选题 Which of the following concerning the internal clock structure is NOT tree?

A、 Our daily routine and realities are very important to maintain the internal clock structure.
B、 People should keep themselves busy in order to maintain the internal clock structure.
C、 Once the internal clock structure is disrupted, we feel very uncomfortable.
D、 Once the internal clock structure is disrupted, it takes some time for the structure to function properly again.

【正确答案】 B

【答案解析】[命题目的] 此题考察对常识的理解。
[解题要点] 在准确理解问题要求后，通过常识性的判断即可知晓答案为B项。
[思路拓展] 对于此类问题可以通过其他正确的选项，利用排除法验证。