Hundreds of people who were killed or injured in the explosion were all African Americans.

A．the ways in which cells formed
B．changes in organic life
C．the main ways in which organisms develop
D．processes on which organic life depends

A．the application of scientific knowledge to the skills of industry
B．the application of science and industry to daily life
C．science and industry' as the basis of progress
D．the use of science and industrial techniques in gaining control of the universe