4.【答案】A【解析】HV侵入人体的初期能够大量增殖,原因是人体此时还没有产生针对HV的抗体,A项错误;HIV抗体检测和抗原检测均利用抗体能识别相应抗原,并与抗原发生特异性结合的原理,B项正确;感染HIV到机体产生抗体需要一段时间,所以在“窗口期”无法检测到HV抗体,C项正确;HIV侵染人体的T细胞,在“无症状期IV不断破坏T细胞,造成T细胞大量死亡,HIV数量持续增多,机体免疫力降低,D项正确。

第二节One possible versionI heard the footsteps and the light tap on the door. Mylegs trembling and tears streaming down, I hid myself behindBrother Lu. Mom walked in first, hugged him and then looked atme with a weak smile. Her eyes were swollen from crying. Andthen Dad was there. without even shaking hands with BrotherLu, he came straight to me and gathered me up into his strongarmsHolding me close, he whispered, I love you foreverThen he pulled back and looked at me with love and pride. "T'mterribly sorry, Daddy. I love you so much, I said thankfully.I know. Let's go home. " Just then, all my fear was gone. I realizedthat I was still Daddys little girl. And i was convinced that thoughthere would probably be unimaginable difficulties and pains thatlay ahead of me, I could get them over because I had a strong andloving family that would always be there for me

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