A：浆细胞接触靶细胞，导致靶细胞裂解，从而使病菌抗原被白细胞介素消灭
B：浆细胞接触靶细胞，导致靶细胞裂解，从而使病菌抗原被抗体消灭
C：效应T细胞接触靶细胞，导致靶细胞裂解，从而使病菌抗原被外毒素消灭
D：效应T细胞接触靶细胞，导致靶细胞裂解，从而使病菌抗原被抗体消灭
我国是互联网大国，网民人数已超过5亿。随着互联网的快速发展，网络谣言也在滋生蔓延，既有针对个人的诽谤，也有对公共事件的捏造，如不依法加强管理，将危害社会稳定和经济发展。H7N9禽流感疫情和四川地震发生后，国家相关部门果断出击，一批网络谣言的制造者、传播者被依法拘留或教育训诫。
根据句意和汉语注释，写出单词的正确形式。(1)After the exam, our teacher came into the classroom with a ____ （满意的）smile on his face.(2)The little boy was thirty, so the old lady ____ （提供）him a glass of water.(3)For your own ____ （安全）, remember not to drive after drinking.(4)What a pretty gold ring! It was ____ （专门地）designed for her.
