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21．While income worry is      rather common problem of the aged, loneliness is another problem that       aged parents may face     A．a; 不填                   B．the；不填              C．a：the                         D．the，：the 22．The control and prevention of H1Nl is a big to China as well as the whole world．     A，surprise                   B．challenge                C．reaction                       D．threat 23．Although many heroes’family members were killed in“5. 12”Wen Chuan earthquake, they choked back their sobs to rescue other survivors      their personal safety．     A．instead of                                                                    B．because of                  C．regardless of                                                             D．in case of，大小：707 KB