单选题 What fears people most?

A、 Poultry will infect many people.
B、 The disease can spread quickly among people.
C、 There will be human-to-human transmission.
D、 A new disease combining bird and a human flu will break out.

【正确答案】 D

【答案解析】[考点] 细节题 [解析] 由文章第四段第一句可知，故选D。