Canada's largest city is______.

A．Mr. Dejoie was detained because he made a trip to the United States and Canada secretly.
B．Mr. Dejoie’s call for popular uprising in Haiti led to his detention.
C．Mr. Dejoie was detained as long as 48 hours.
D．Mr. Dejoie was held in prison on a charge of inciting public disorder.

A．Physiological problems of space flight.
B．Speed and gravity of space flight.
C．Gravity and acceleration of space flight.
D．Acceleration and deceleration of space flight.