A.India | B.America |
C.Britain | D.China |
A.Over 300. | B.Over 500. |
C.Over 1,800. | D.Over 1,300. |
A.Surprised. | B.Pleased. |
C.Nervous. | D.Tired. |
A.young children laugh much more often than adults in a day |
B.laughing is one of the best ways to stay healthy |
C.many doctors are also interested in the effects of laughter on our health |
D.real laughter and unreal laughter are both good for health |