Scientists have decided to declare ____

问题选择题

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

答案

题目分析：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。