单选题
One reason why the outbreak of the disease was not discovered sooner was that ______.
A、
China did not belong to W. H. O.
B、
doctors in Asia did not recognize the disease
C、
reporting procedures were not good enough
D、
the people who caught it were travellers
【正确答案】
A
【答案解析】
解析：由文章第五段第三、四句可知，该流感最早在中国爆发，但中国那时不是世界卫生组织的成员，没有向世界卫生组织报告。
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