题目

词汇运用 1.She  won a skating c____________ when she was ten. 2.Chopin became______________(serious) ill when he was only 25. 3.We need to have the a___________ to live alone in the society. 4.It’s natural to feel unsure of ourselves when ___________(start) conversations with strangers. 5.It’s very c______________ to go shopping because I live near a supermarket 6.Why not consider_______________(visit) Pairs? 7. I know a boy __________(call) Tony. 8.B___________singing English songs, we study English by working in groups. 9.I’d love to sail __________(cross) the Pacific. 10.I 我国艾滋病毒感染者已超过100万。艾滋病已成为本世纪对人类健康威胁最大的传染病之一。因此，了解艾滋病的相关知识，以及如何与艾滋病感染者相处，是每一个公民应具备的生物学常识。根据你学过的知识，回答下列问题：（1）艾滋病是由于感染了人类免疫缺陷病毒（HIV）引起的，那么HIV是这种传染病的______________。艾滋病患者属于传染病流行三个环节中的__________________，传染病流行的另外两个环节是_________________________和________________________________。（2）为了更好地预防艾滋病，很多科研工作者正在研制艾滋病疫苗，使人们获利对艾滋病的免疫力，这种免疫属于_____________________免疫。（填“非特异性免疫”或“特异性免疫”）。