2 . Recently, doctors have observed more and more children _______ with the virus.

A．infected

B．infecting

C．to infect

D．be infected

3 . The film, ____ almost a quarter-century, tells the story of Henry Hill.

A．spanning

B．excluding

C．infecting

D．irritating

4 . She _______ the children with her enthusiasm for music.

A．charged

B．responded

C．infected

D．subjected

6 . 词性转换
1. infection n.感染；传染→ ________ vt.使感染；传染
2. proof   n.证据；证明；检验→________ vt.证明link   v.证明是
3. substantial   adj.大量的；价值巨大的；重大的→________ n.物质；物品；事实根据
4. initial   adj.最初的；开始的；第一的→________ adv.起初
5. defend   vt.保卫；防守；辩解→________ n.防御；保卫
6. assistant   n.助理；助手→________ vt.帮助；协助→________ n.帮助；协助；援助
7. gifted   adj.有天赋的；有天才的；天资聪慧的→________ n.礼物；天赋

9 . 词性转换
1. severe adj. 极为恶劣的；十分严重的；严厉的→________ adv. 严重地；严格地，严厉地
2. infection n. 感染；传染→________ vt. 使感染；传染→________ adj. 传染性的；感染的（尤指通过呼吸）
3. pure adj. 干净的；纯的；纯粹的→________ v. 净化
4. transform vt. 使改观；使改变形态 vi. 改变；转变→________ n. 变化；转变；变换
5. thinking n. 思想；思维；见解→________ v. 认为；思考
6. finding n. 发现；调查结果；(法律)判决→________ v. 发现 →________ n. 发现者
7. mechanical adj. 机械的；发动机的；机器的→________ n. 机械师；机械修理工
8. defend vt. 保卫；防守；辩解→________ n. 防护；辩护
9. assistant n. 助理；助手 adj. 助理的；副的→________ v. 帮助；协助；援助→________ n. 帮助；协助；支持
10. gifted adj. 有天赋的；有天才的；天资聪慧的→________ n. 礼物；天赋
11. steady adj. 稳定的；平稳的；稳步的→________ adv. 平稳地；持续地
12. vivid adj. 生动的；鲜明的；丰富的→________ adv. 生动地

10 . 医生护士们不顾感染上新冠病毒的危险，在病房里忙碌着。
_______ ________ of the danger of being _______ with COVID-19,the doctors and nurses were busy working in the wards.