The United States court system is characterized by（）hierarchies: there are both state and federal courts.

单项选择题Although this book claims to be a biography of George Washington, many of the incidents are imaginary（）

A．fascinating
B．factitious
C．fastidious
D．fictitious

单项选择题The prevailing wind is the wind direction most often observed during a given time period. Wind speed is the rate at which the air moves past a stationary object（）

A. motionless
B. massive
C. flexible
D. noticeable