单选题
In order to remain fully awake at work, people working night shifts should ______.
A、
have longer sleep periods after work
B、
make the light darker than usual
C、
try to re-set their "internal clock"
D、
pay more attention to their work
【正确答案】
C
【答案解析】
[解析] 为了在干活时保持清醒，值夜班的工人该怎么做呢?短文第四句话提到一种照光治疗法，其实就是为了调节他们的内部时钟(adjust their internal clock)，因此答案选C。
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