语法与词汇 During the 300 years between its introduction intomedicine and World War I, quinine was the only effectiveremedy for malaria.

【正确答案】 D

【答案解析】句意：在初次用于药物到第一次世界大战的300年间，奎宁是治疗疟疾的唯一有效药物。remedy补救；治疗。