Scientists have decided to declare war on AIDS in order to make breakthrough in treating it.
A. a, a
B. /, a
C. a, the
D. / , the
网友回答
A. a, a
(答案→)B. /, a
C. a, the
D. / , the
解析：考查冠词：句意：科学家已经决定向艾滋病宣战，为了在疗法上有突破。第一空不填，declare war on对…宣战，第二空填a， make a breakthrough有突破，选B。