A．Dog is better than a cat because it needs regular exercises.B．More than half of the 6,000 people enjoy good health.C．People who have pets in the research have relatively good health.D．A cat is better than a dog because it does not spread diseases.
A．Dog is better than a cat because it needs regular exercises.
B．More than half of the 6,000 people enjoy good health.
C．People who have pets in the research have relatively good health.
D．A cat is better than a dog because it does not spread diseases.