250-17 There has been a 30 to 40 fold increase in the incidence of malaria caused by increasing mosquiito resistence against pesticides. A) Increase in the incidence of malaria caused by increasing mosquiito resistence against B) increase in the incidence of malaria because of increasing resistence of mosquitos to 答案是B 我想問的是A為什麼不對 謝謝 | 
