Have you ever regretted doing something you shouldn't have done or something you didn't do which you should have？ At one time or another we probably all have.There's no __51in getting depressed about it now—it's no __52 crying overspilt（溢出的)milk.However,there may be some gain in thinking about exactly what happened and why __53 we might be able to draw some conclusions for the future.
One thing we all do now and again is to lose our __54 with a friend or close relative.The odd thing is that we more often display great __55 towards someone we are fond of than towards __56 .The explanation may be that we see friends and relatives as a kind of safety net, an opportunity to __57 a bit of steam in a safe environment,while the consequences （后果)of __58 a stranger could be far more serious.
Being honest is usually thought of as a virtue （美德) and undoubtedly this is the __59 .On the other hand,we have all experienced occasions when we have spoken our minds to someone,telling them exactly what we feel,and then have found ourselves filled with feelings of __60 .Perhaps we should have kept our mouths shut？
A. reason B. purpose C. point D. result
A. use B. help C. value D. benefit
A. so B. because C. but D. though
A. mind B. memory C. manner D. temper
A. anger B. interest C. love D. respect
A. strangers B. friends C. relatives D. colleagues
A. run through B. throw away C. give up D. let off
A. inviting B. insulting C. speaking to D. believing in
A. issue B. case C. event D. factor
A. excitement B. happiness C. pride D. guilt
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科学家初步研制出H5N1型禽流感疫苗，应用前必须进行动物实验检测其效果，将未感染H5N1型病毒的一群健康小鸡分为A、B两组，实验过程和结果如下图所示，下列相关分析错误的是
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A．B组小鸡全部死亡是因为体内没有足够抗H5N1型病毒的抗体B．B组小鸡全部死亡是因为体内没有控制产生抗H5N1型病毒抗体的基因C．A组小鸡存活是H5N1型疫苗和有关淋巴细胞相互作用的结果D．A组小鸡存活最可能是体液免疫和细胞免疫共同作用的结果
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以下关于艾滋病（AIDS)的叙述，错误的是①AIDS患者出现病症的直接原因是其它病原体感染②HIV攻击人体免疫系统，特别是B淋巴细胞③HIV侵入人体后存在潜伏期，原因是潜伏期HIV复制能力较弱④感染HIV的人称为AIDS患者，应尽快治疗⑤目前还没有根治AIDS的特效药
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A．②③⑤B．①④⑤C．②③④D．①②③
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As a child,I was truly afraid of the dark and of getting lost;these fears were very real and caused me some uncomfortable moments.
A. way B. time C. place D. reasonA. wounded B. destroyed C. surprised D. frightenedA. quietness B. darkness C. emptiness D. lonelinessA. got B. forced C. made D. causedA. spirit B. height C. body D. shapeA. eye B. window C. mouth D. doorA. breath B. wind C. air D. soundA. belief B. feeling C. imagination D. doubtA. lay B. hide C. rest D. lieA. especially B. simply C. probably D. directlyA. discussion B. problem C. joke D. matterA. though B. yet C. although D. stillA. called B. backed C. lined D. packedA. old B. crowded C. poor D. unfamiliarA. leave B. let C. order D. sendA. above B. in C. of D. atA. protected B. guided C. believed D. acceptedA. then B. there C. once D. anywayA. strict B. powerful C. heavy D. rightA. realize B. remember C. recognize D. recover
Maybe it was the strange__36 things looked and sounded in my familiar room at night that__37 me so much.There was never total__38 ,but a streetlight or passing car lights__39 clothes hung over a chair take on the__40 of a wild animal.Out of the corner of my__41,I saw the curtains seem to move when there was no__42 .A tiny sound in the floor would seem a hundred times louder than in the daylight.My__43 would run wild,and my heart would beat fast.I would__44 very still so that the“enemy”would not discover me.
Another of my childhood fears was that I would get lost, __45 on the way home from school.Every morning I got on the school bus right near my home—that was no__46 .After school, __47 ,when all the buses were__48 up along the street,I was afraid that I'd get on the wrong one and be taken to some__49 neighbourhood.On school or family trips to a park or a museum,I wouldn't__50 the leaders out of my sight.
Perhaps one of the worst fears__51 all I had as a child was that of not being liked or__52 by others.Being popular was so important to me__53 ，and the fear of not being liked was a__54 one.
One of the processes（过程) of growing up is being able to __55 and overcome our fears.Understanding the things that frightened us as children helps us achieve greater success later in life. -
（选做题)请根据免疫基本原理回答下列问题：（1)能正确表示病毒或病菌侵入机体后，引起血液中抗体浓度变化的是（①表示第一次感染，②表示第二次感染)______。
（2)根据病毒入侵机体后引起血液中抗体浓度变化的规律，为提高人体对病毒的免疫能力，应采取的措施是向人体注射________。A．灭活抗原B．抗体C．抗生素D．抗病毒药物（3)B淋巴细胞和T淋巴细胞依靠细胞膜表面的______识别抗原。（4)机体合成的数百万种抗体对抗原的特异性识别，是由于抗体分子结构中的________不同。
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关于免疫学的应用，下列说法正确的是
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A．目前，预防艾滋病最有效的措施是预防接种B．向人体注射甲肝疫苗可预防甲型肝炎C．器官移植中，只有当供者与受者HLA完全一致时，才能进行移植D．接种卡介苗可预防小儿麻痹