单项选择题
A．the spectacular scientific and technological advances B．people’s hard working C．learning from other cultures D．the industrial revolution
A．By overlooking the most obvious of everyday life. B．By setting up new symbols for a nation’s daily life. C．By turning symbols of everyday life into fear and anxiety stimulant. D．Through hijacking big planes from the most famous international airlines.
A. plants absorb useful chemicals to promote their growth B. plants produce certain chemicals to combat pests and diseases C. farmers use chemicals to protect plants against pests and diseases D. farmers use man-made chemicals to dissolve the natural chemicals in plants