单项选择题

It can be inferred from the passage that brain size is assumed to ______.

A．be an indicator of cognitive ability
B．vary among individuals within a species
C．be related to food consumption
D．correspond to levels of activity
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单项选择题
The best solution for implementing the 24-hour working system seems to be ______.
A．to change shifts at longer intervals
B．to have longer shifts
C．to arrange for some people to work on night shifts only
D．to create better living conditions for night workers
单项选择题
The main problem of the round-the-clock working system lies in ______.
A．the inconveniences brought about to file workers by the introduction of automation
B．the disturbance of daily life cycle of workers who have to change shifts too frequently
C．the fact that people working at night are often less effective
D．the fact that it is difficult to find a number of good night workers
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