A．Paid much attention to the results of scientific discoveries.
B．Seldom introduced safety laws before disasters occurred.
C．Hardly ever looked into the causes of tragedies.
D．Imposed safety rules as soon as accidents took place.

A．Marie benefited a lot from the practical lessons.
B．Marie was able to read stories with the help of her son.
C．Marie decided to continue her studies in school.
D．Marie found her lessons more challenging than her children’s.