After some experiments, the doctors found that ______.
A、the influenza could be cured like other types of influenza
B、the influenza must be treated in a special way
C、the influenza did not have to be treated
D、the influenza could not be cured by any known medicine
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试题解析
答案为D。根据第三段最后一句,This then,was something new:a new influenza virus against which the people of the world had no ready help whatsoever 作出该项选择。其他选项在文章中根本未提。