单项选择题

Which of the following can best express the main idea of the passage ( )

A．Henry Ford changed American society with his invention of cars.
B．Henry Ford had a personality different from ordinary people.
C．Henry Ford was one of the greatest American industrialists.
D．Henry Ford built the first assembly line in the world.
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单项选择题
What could be said about the adrenalin ( )
A．It is secreted by the kidneys into the bloodstream.
B．It is hormone that prepares the body for emergencies.
C．It is the only useful hormone produced in the body.
D．It is essential to sustain life.
单项选择题
It is ______ that mainly helps you respond to a dangerous or stressful situation. ( )
A．a signal sent by your brain
B．the special function of the adrenal gland
C．all stimulated parts of your body
D．All of these
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