单项选择题

What is the main topic of the passage

A．The effect of advertising on world markets.
B．Modem advertising techniques.
C．Forms of communication in the American colonies.
D．The early history of advertisin

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单项选择题

According to the professor, what were, the beliefs of the Greek philosophers based upon

A．How the natural world was described in Greek mythology.
B．What they observed directly.
C．The writings of philosophers from other societies.
D．Measurements made with scientific instruments,

单项选择题

What does the speaker illustrate with the example of muscle

A．The need to exercise the memory.
B．How the brain differs from other body tissues.
C．The unconscious learning of a physical activity.
D．How nerves control body movement.