摘要： AIDS control and prevention is a to China as well as the whole world. A. surprise B. reaction C. challenge D. threat
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AIDS control and prevention is a ________ to China as well as the whole world.
A. surprise B. challenge C. reaction D. threat
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AIDS control and prevention is a _______ to China as well as the whole world.
A. surprise B. challenge C. reaction D. threat
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AIDS control and prevention is a to China as well as the whole world.
[ ]
A. surprise
B. challenge
C. reaction
D. threat
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B. challenge
C. reaction
D. threat