A：病毒只有寄生在活细菌内才能生活
B：病毒依靠自己的遗传信息和宿主细胞内的物质制造新的病毒
C：病毒侵入人体后，会刺激淋巴细胞产生抵抗该病原体的抗体
D：给埃博拉出血热患者，注射该病痊愈者的血清进行治疗，属于非特异性免疫力
Don't____ ____ the computer．
词语书写正确的一组是（ ）
American boys and girls like watching TV. Some children spend six hours a day at school and four to six hours a day in front of the TV sets. Some children even watch TV for eight hours or more on Saturday. Television（电视）is like books and films . A child can learn good things and bad things from it. Some TV programs help children to understand the news, the people and places from other countries. With TV, children do not have to go out to see films, they can hear interesting music or watch a game at home. But some programs are bad for children, so parents sometimes help them to find other interesting and useful things to do.
