Recently, one of my best friends, whom I've shared just about everything with since the first day of kindergarten, spent the week end with me. Since I moved to a new town several years ago, we've both always _\_1__ the few times a year when we can see each other. .Over the _\_2___, we spent hours and hours, staying up late into the night, talking about the people she was _\_3__ around with. She started telling me stories about her new boyfriend, about how he experimented with _\_4__ and was into other _\_5__ behavior. I was blown away! She told me how she had been _\_6__ to her parents about where she was going and even sneaking out to see this guy because they didn't want her _\_7__ him. No matter how hard I tried to tell her that she _\__8__ better, she didn't believe me. Her self-respect seemed to have disappeared. I tried to _\_9__ her that she was ruining her future and heading for big trouble. I felt like I was getting _\_10___. I just couldn't believe that she really thought it was _\_11__ to hang with a bunch of losers, especially her boyfriend. By the time she left, I was really worried about her and _\_12__ by the experience. It had been so frustrating, I had come _\_13__ to telling her several times during the weekend that maybe we had just grown too far apart to _\_14__ our friendship - but I didn't. I put the power of _\_15__ to the ultimate test. We'd been friends for far too long. The chance was that she _\_16__ me enough to know that I was trying to save her from hurting herself. I wanted to believe that our friendship could _\_17__ anything. A few days later, she called to say that she had thought long and hard about our _\_18___, and then she told me that she had _\_19__ with her boyfriend. I just listened on the other end of the phone with tears of joy running down my face. It was one of the truly _\_20___ moments in my life. Never had I been so proud of a friend.
A. worried about B. looked forward to C. paid attention to D. think ofA. weekend B. months C. years D. daysA. working B. falling in love C. hanging D. keeping in touchA. books B. girls C. friends D. drugsA. self-destructive B. self-respectingC. self-confident D. self-defensive
A. explaining B. reasoning C. declaring D. lyingA. on B. beside C. around D. toA. did B. deserved C. had D. gotA. told B. convince C. force D. warnA. somewhere B. everywhere C. nowhere D. anywhereA. acceptable B. believable C. reliable D. admirableA. exhausted B. surprised C. satisfied D. terrifiedA. almost B. nearly C. close D. overA. stop B. continue C. start D. makeA. love B. friendship C. truth D. justiceA. thought B. remembered C. valued D. hatedA. mean B. conquer C. tell D. proveA. friendship B. relationship C. quarrel D. conversationA. broken away B. broken down C. broken up D. broken outA. demanding B. challenging C. frustrating D. rewarding
I am so worried about global warming. We need stop cutting down all of the trees so that they can absorb the carbon dioxide. I think the _Kyoto Protocol_（京都议定书) to stop pollution is a great idea ,and I hope our country will decide to follow it, too. — Eli S.,10,Texa People should do all they can to help stop pollution, even if it is something as little as recycling your soda can. Every little thing helps. Maybe schools can put recycling bins in classrooms. Students can bring in all of their cans and bottles and see how many the school can collect. — Lindsey A.,11, Massachusett The United States should take action to help stop pollution. Since we are one of the richest countries, we should at least spend a little money to help. — Aaron z,11,Massachusett It is not good that the United States is not following the Kyoto Protocol. The U.S. is one of the most pollution emitting （污染物排放)countries in the world. Even if the rest of the world agrees to follow those rules, without the U. S. and its big businesses agreeing, global warming will still be a big problem. —Augustine S.,11,Ohio The world needs to learn more about global warming problems. If we do not do something soon then some of Earth’s coolest animals will become extinct. People should use solar power instead of things that pollute the atmosphere! — Jillian J.,10,Pennsylvania Global warming is very dangerous, and it must be prevented. Even if people think that it cannot be stopped ,we should at least try. Stopping global warming is more important than keeping our businesses going. What about the _penguins_（企鹅)and the polar bears？ We can’t just let them become extinct. —Samantha R.,11,Illinois 小题1:Why does Lindsey suggest schools put recycling bins in classrooms？
A．To keep the classroom clean
B．To help protect wild animals.
C．To help protect our earth.
D．To collect waste in classroom.小题2:Augustine worries that global warming problems will be difficult to solve because
.
A．many people think that global warming cannot be stopped
B．more and more trees are being cut down
C．American government spends little money stopping pollution
D．the U.S. refuses to follow the Kyoto Protocol小题3:Jillian and Samantha believe that
.
A．solar power is earth-friendly energy
B．global warming threatens animals’ survival
C．America is the richest country in the world
D．the penguins and the polar bears are dying out小题4:What do the six children mainly talk about？
A．Environmental problems.
B．The Kyoto Protocol.
C．Animal protection.
D．The climate change.
在体液免疫和细胞免疫中，均有记忆细胞产生。记忆细胞产生于
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A．感应阶段，由B细胞增殖分化而来B．反应阶段，由B细胞和T细胞增殖分化而来C．效应阶段，由T细胞增殖分化而来D．感应阶段、反应阶段和效应阶段三个阶段
禽流感是禽类流感病毒引起的，对家禽和人类有很大危害的传染病，下列叙述中属于体液免疫的是①注射禽流感病毒疫苗，使机体产生抗体，与入侵的禽流感病毒结合，抑制病毒的活性②抗体与病毒结合后，使病毒失去侵染和破坏宿主细胞的能力③效应T细胞产生淋巴因子发挥免疫效应④将患病的家禽深埋处理⑤形成沉淀被吞噬细胞吞噬消化
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A．①②③B．①②⑤C．③⑤D．①③④⑤
疫苗对预防传染病具有重要意义。为研制抗某种病毒的灭活病毒疫苗，研究人员设计实验方案如下：
（1)制备疫苗
将纯化的某种病毒在特定的_______\_中培养、增殖。收获病毒后用灭活剂杀死，但要确保灭活病毒的____________不被破坏且能被免疫细胞识别。这样得到的灭活病毒即为本实验所用的疫苗。
（2)用实验动物检测疫苗刺激机休产生抗体的能力
①．实验原理：通过接种疫苗，灭活病毒进人实验动物体内可刺激B细胞，使之增殖、分化形成效应B细胞并产生相应的_____\_；当_____\_病毒再次人侵时，机体能产生更强的特异性免疫反应，包括__________。
②．实验过程：将健康的实验动物分成对照组和多个实验组，每组若干只动物。
对照组的处理：接种不含疫苗的接种物，一段时间后再___\_。实验组的处理：接种____\_。一段时间后再接种病毒。为确定该疫苗的有效浓度，不同实验组动物需接种________的疫苗。
③．分析实验结果：统计实验组和对照组动物的发病率、存活率。
若该疫苗可以刺激机体产生足够的抗体，则实验组比对照组发病率___\_，存活率_________。
下列为体液免疫图解，请分析判断下列说法正确的是：
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A．细胞①～⑤均能识别抗原B．细胞⑤为靶细胞C．细胞③为B细胞D．阶段Ⅵ产生的物质是淋巴因子