29.People who have spent a lot of time in contact with animals often develop animal-induced allergies,some of them quite serious.In a survey of current emplyees in major zoos,about 30% had animal-induced allergies.Based on this sample,experts conclude that among members of the general population who have spent a similarly large amount of time in close contact with animals,the percentage with animal-induced allergies is not 30% but substantially more.
Which of the following,if true,provides the strongest grounds for the experts' conclusion?
A.A zoo employee who develops a serious animal-induced allergy is very likely to switch to some other occupation.
B.A zoo employee is more likely than a person in the general population to keep one or more animal pets at home.
C.The percentage of the general population whose level of explosure to animals matches that of a zoo employee is quite small.
D.Exposure to domestic pets is less likely to cause animal-induced allergy than exposure to many of the animals kept in zoos
E.Zoo employees seldom wear protective gear when they handle animals in their care.
答案是A,我也选对了，但是是因为其他选项根本就不沾边，请教大家为什么A对了。谢谢！ | 
