23（）

单项选择题It can be inferred that （）

A．Henry Ford always tried to avoid waste
B．Henry Ford required total observation once the standards were established
C．Henry Ford always encouraged his workers to make changes oft he products
D．Henry Ford made his own designs of his cars

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