A．They are written by teenagers who are in love.
B．They deal with the teenagers' pain of love.
C．They show the teenagers' ideas about love.
D．They teach teenagers how to love others.
A．They are seldom used in poems.
B．They can make a poem blunt.
C．They are needed in a poem.
D．They are mostly used to express feelings.
A．Waste products that can be prevented or disposed of sensibly.
B．Artificial and natural substances released into the environment.
C．Advertising that persuades people into buying products.
D．Nuclear power stations that cause ecological imbalance.