A.had improved
B.has improved
C.is improving
D.improved

A.Because
B.Because of
C.In spite of
D.Although

A.future
B.involve
C.prospect
D.guidance

A.motivate
B.furniture
C.advantage
D.ambulance

A.famous
B.enormous
C.dangerous
D.cautious

A.the number of beverage makers
B.the average age of the consumers
C.the mixture of various ingredients
D.natural chemicals in a person's body

A.reasonable
B.unlikely
C.typical
D.impossible

A.Types of Power Plants
B.Electricity: Harmful Effects on Our Life
C.How to Produce Electricity
D.Why Electricity Is So Remarkable

A.Types of Power Plants
B.Electricity: Harmful Effects on Our Life
C.How to Produce Electricity
D.Why Electricity Is So Remarkable

A.suggest that electricity should be alternated with safer sources of energy
B.emphasize the usefulness and adaptability of electricity
C.imply that electricity is not the only useful source of energy
D.discuss which source of energy can be a suitable alternative to electricity