AIDS control and prevention is a   to China as well as the whole world．
A．surpriseB．challenge C．reaction D．threat
B
考查名詞辨析：A．surprise 驚訝，B．challenge挑戰(zhàn)，C．reaction反應D．threat威脅，句意是：艾滋的控制和預防對中國乃至全世界都是挑戰(zhàn)。選B。
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