单项选择题

What is the passage mainly about

A．The first controlled, powered flight.
B．The beginnings of aviation.
C．The Wright Brothers.
D．The Wright family.
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Selye moved to America after completing studies in Europe in order to______.
A．earn a doctorate
B．accept a fellowship
C．work in Canada
D．retire
单项选择题
What does the passage mainly discuss
A．Selye's professional life and achievements.
B．The origins of the word "stress".
C．Defining stress.
D．The father of the stress fiel
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