单项选择题

According to the passage, which of the following is right

A．The structuralism gift of the human brain is that it can invent whole languages.
B．The structuralism gift of the human brain is that it can add tiny structures up to a language.
C．The human vocal system can, like traffic signals, produce sounds a little now and a little then.
D．To separate specific sounds and oppose one to the other is one of the structuralism gifts of the human brain.
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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
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
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