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The infectious disease known as whooping cough is commonly thought to be a childhood illness, but a recent study suggests that more adults contract this illness than was previously suspected. Although the disease is life-threatening in children, in adults it typically causes only a persistent cough which, though annoying,is rarely serious. Therefore, the incidence of whooping cough in adults poses no significant public health threat.

第1题

Which of the following is an assumption on which the argument depends?

AWhooping cough is more difficult to diagnose in adults than in children.
BAdults with whooping cough do not readily transmit the disease to children.
CMost adults who contract whooping cough get the disease from children with whom they are in close contact.
DA disease poses no significant public health threat unless it is life-threatening.
EUnder comparable conditions of exposure, adults contract whooping cough more readily than do children.

B显示答案

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