His presidential address in New York （）on the importance of communication between science and industry.

单项选择题Nothing has ever equaled the （）and speed with which the human species is altering the physical and chemical world.

A．concern
B．magnitude
C．volume
D．carelessness

单项选择题The United Nation Law of the Sea Conference would soon produce an ocean-mining treaty following its （）declaration in 1970 that oceans were the heritage of mankind.

A．unanimous
B．abstract
C．autonomous
D．almighty