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
Of the three languages below, grammatically the simplest one is ______.
A．Anglo-Saxon English
B．Latin
C．Modern English
D．Indo-European
单项选择题
Why is the question of how easily people can get used to working at night no mere academic
A．Because few people like to reverse the cycle of sleep and wakefulness.
B．Because sleep normally coincides with the hours of darkness.
C．Because people are required to work at night in some fields of industry.
D．Because shift work in industry requires people to change their sleeping habits.
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