单项选择题

What makes human beings different from the rest of the animal world is their ability to ______.

A．learn a number of words
B．be taught a few grammatical structures
C．invent whole languages
D．to express their thoughts and feelings
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单项选择题
The main problem of the round-the-clock working system lies in ______.
A．the inconveniences brought about to the workers by the introduction of automation
B．the disturbance of the daily 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
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 employ people who work on night shifts only
D．to create better living conditions for night workem
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