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1£®AIDS control and prevention is a________to China as well as the whole world.
A£®surprise¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡ B£®challenge
C£®reaction D£®threat
2£®It is reported that the police will soon________the case of the two missing children.
A£®look upon B£®look after
C£®look into D£®look out