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Scientists have decided to declare ____ war on AIDS in order to make ____ breakthrough in treating it.
A.a, aB./, aC.a, theD./ , the
B

试题分析: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。
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