         Sentence 4:'WHO spokeswoman ‘Maria Cheng:  agreed, saying :.". It looks very much I ike,  Gn isolated event. 2    Sentence <2: .* tt ‘ooks ‘very. much like an,  isolated“ event: °, * "World «.Heatth  Deganization .. spokeswoman” Maria. Cheng  ‘said: . :    