B The worst danger is a house on fire when people are asleep. Always be ready to leave through a window into the garden by making sure you can open it if necessary. If you should be on holiday in a tall building or hotel, make sure you know where the fire escape（太平梯) is. When you can’t find any way out, try to find pieces of cloth and make a rope to get out of a window to safety. If you smell burning in your home, get out right away. If you can’t breathe properly because of smoke on your way out, crawl（爬) on your hands and knees because smoke rises and the air will be cleaner near the floor. Smoke is a killer and more people die from breathing it in than actually being burned. Fire in a cinema hall or public place often means people pushing to reach a door. Keep your head up with arms up in front of your chest. This protects your chest and gives you the best chance to breathe. Above all, don’t get frightened!

When a tall building is on fire, people______.

A.can leave by coming down the fire escape   B.should first check the room window C.had better find a long rope         D.must lie down on the floor at once

People can leave a burning house through a window if ______.

A.there is smoke in the room      B.  there is no other way out C .they can’t breathe properly      D.  they want to put out the fire

There are several things to do to keep one safe. Which of the following is not talked about in the passage？

A.Leave the house right away when you smell something burning. B.Raise your head and keep your chest from being hurt. C.Get out of the house by crawling on the floor. D.Rush out of the house, dressed in wet clothes.

Which of the following is not true？

A.In a fire, more deaths are caused by smoke. B.The most important thing is not to be frightened in a fire. C.When a public place is on fire, people usually push to leave. D.Be ready to leave a burning house through a window if there is a garden down below.

完型填空（共20小题；每小题1分，满分20分）
阅读下面短文，掌握其大意，然后从第21—40各题所给的四个选项（
A、B、C和D）中，选出最佳选项，并在答题卷上将该项涂黑。
Just ten years ago, I sat across the desk from a doctor with a serious look. “Yes,” he said, “there is a serious injury in the left lung…” I listened, too  21  to speak, as he continued, “You’ll have to  22  work at once and go to bed. Later on, we’ll see.” He gave no definite promise of recovery.
Feeling like a man who has suddenly been placed under  23  of death. In the next three days, I  24  my affairs; then I went home, got into bed, and set my watch to tick off not the minutes,  25  the months. Two and a half years and many crashed hopes later, I left my bed and began the long  26  back. It was another year before I made it.
I speak of this experience because these years that passed so  27  taught me what to believe and what to  28  . They said to me: Take time,  29  time takes you. I realize now that this world I’m living in is not my oyster（牡蛎）to be opened but my opportunity to be  30  . To me, each day is such a  31  gift. The sun comes up and presents me with 24 brand new, wonderful hours—not to pass, but to  32  .
I’ve learned to  33  those little but all-important things I never thought I had the time to notice before: the play of light on  34  water, the music of the wind in my favorite pine tree. I seem now to see and hear and feel with some of the recovered  35  of childhood. I recall the touch of the springy earth under my feet the day I first stepped upon it after the years in bed. It was like  36  one’s citizenship in a world one had nearly lost.  37  ,I sit back and say to myself, let me make a  38  of this moment I’m living right now. All this, I owe to that long time spent on the deadlines of life. Wiser people come to this awareness  39  having to acquire it the hard way. But I wasn’t wise enough. I’m  40  now, a little, and happier.
21．
A．frightened B．embarrassed   C．shocked   D．confused
22．
A．pick up   B．give up   C．take up   D．keep up
23．
A．sentence  B．shadow   C．pressure   D．trial
24．
A．figured out    B．looked after   C．cleared up D．concentrated on
25．
A．or   B．and  C．nor   D．but
26．
A．jump B．walk  C．rush  D．climb
27．
A．quickly   B．slowly    C．quietly    D．easily
28．
A．expect    B．desire    C．obtain    D．value
29．
A．before    B．after  C．until  D．when
30．
A．picked    B．accepted  C．grasped   D．quitted
31．
A．precious  B．potential  C．pleasant   D．permanent
32．
A．spend    B．fill   C．employ   D．kill
33．
A．observe   B．appreciate C．ignore    D．respect
34．
A．falling    B．rolling    C．running   D．pouring
35．
A．ignorance B．absence   C．carelessness    D．freshness
36．
A．regaining  B．requiring  C．rebuilding D．recovering
37．
A．Regularly B．Immediately   C．Frequently    D．Continuously
38．
A．copy B．note  C．study D．summary
39．
A．beyond   B．by   C．without   D．through
40．
A．better    B．stronger   C．wiser D．healthier

下列关于人体免疫的叙述，正确的是

[  ]

A．T淋巴细胞受抗原刺激可增殖分化为效应T细胞和记忆细胞B．在细胞免疫中，由B细胞分化成的浆细胞分泌抗体C．非特异性免疫的第一道防线由皮肤、黏膜及抗菌物质等组成D．HIV病毒主要攻击B淋巴细胞，导致免疫功能严重缺陷

某人接种了“甲型H1N1流感”疫苗，一段时间后体内出现了相应的抗体，产生抗体的细胞是

[  ]

A．吞（巨)噬细胞B．效应T细胞C．浆细胞D．记忆细胞

下图是细胞免疫中X细胞与靶细胞密切接触后的杀伤作用过程示意图，其中X细胞是指

[  ]

A．B细胞B．T细胞C．效应B细胞D．效应T细胞

请回答与机体免疫有关的问题：

（1)体液免疫的初次免疫反应与第二次免疫反应相比较，产生抗体更多的是________。（2)某种病原微生物（V1)初次侵入机体后，经___细胞摄取和处理，使V1的__\_暴露出来，并传递给___\_，然后再传递给相应的B淋巴细胞。B淋巴细胞增殖分化能形成两种细胞，其中能够产生抗体的细胞是___\__；能够在较长时间内保持对同种抗原做出增殖、分化等快速反应能力的细胞是____；当机体再次受到V1和另一种病原微生物（V2)感染时，细胞乙只能对V1发生免疫反应。细胞乙不能对V2发生免疫反应的原因是_____。