保证机车的完好，同时也保证了（）。A、安全运行 B、快速运行 C、多拉快跑

在汽车内燃机中，汽油气化后与空气混合，进入汽缸，引擎用电火花点燃，燃烧使汽缸内温度升高，气体体积急剧膨胀，产生压力推动活塞，形成动力，燃烧时产生的有害气体通过尾气排入大气．现以辛烷（C₈H₁₈）代表汽油的成分，请回答：

（1）写出辛烷完全燃烧时的化学方程______

（2）辛烷若燃烧不完全，会产生______气体，该气体易与人体血液中的______结合，使人体组织的供氧受到影响．

（3）控制城市汽车尾气对空气污染的方法有______

A．开发氢能源　　　　　B．使用电动车

C．植树造林　　　　　　D．戴上呼吸面具．

阅读理解。

     I can’t remember a winter being as cold as this in Pennsylvania, but I’m sure there were colder days.

     Even though the daylight hours are growing longer minute by minute, it’s easy to find an excuse not to go out unless you absolutely must, but then again I often have to push myself to accomplish things.

     People I speak to have been in all kinds of nasty moods. They say they’re “under the weather,” not feeling good about this time of year.

     As I stood outside with my two dogs yesterday, it was so cold that my nose and face felt frozen and my ears were stinging.

     Of course, that doesn’t matter to Ricky and Lucy. They have a routine they must go through to find just the fighting spot no matter how cold or hot it is.

     So I wait.

     But this time it was different. As cold as it was, I suddenly was excited thinking about how wonderful this extreme cold really was.

     Then the sun broke through the clouds and memories of summer’s extremely hot days flashed through my mind. I could remember standing in the heat of the afternoon, with sweat pouring down my brow and the hot, burning sun against my face. I reminded myself then and there that in the cold of the winter I would wish I had this heat.

     I was grateful for the extremes. Without the extremes in my life, I would never appreciate the days when things were just right. Without the extremes, life would be boring.

     It’s being pushed to one of the extremes that makes us appreciate the middle more. Health challenges remind us that we need to pay more attention to how we live. Financial extremes remind us that when things go smoothly it’s also time to save for raining days.

     I’ve come to the conclusion that all too often I find a reason not to be happy with where I am at that moment.

     Whether it’s hot or cold, good health or bad, in the money or out of it, I always want it to be different.

     I’m tired of being “Under the Weather!”

1. What is the author’s attitude towards the extremes in life?

A. Grateful.

B. Critical.

C. Negative.

D. Unconcerned.

2. That day the writer waited in the terrible cold because ______.

A. his dogs wanted to hunt

B. he wanted to face the cold bravely

C. his dogs had a routine

D. he wanted to be different

3. The underlined word “nasty” (Paragraph 4) can be replaced by ______.

A. unpleasant

B. violent

C. favorable  

D. unusual

4. At last the author drew a conclusion that ______.

A. happiness cannot be gained by complaints

B. things will be different whatever the situation is

C. happiness will fail to come to you if you can find a reason

D. he is disappointed with his present situation

5. What is the best title for this passage?

A. Follow the Routine

B. Two Extremes in Life

C. Changes should be Expected

D. Weather Information

机动车可以选择交叉路口进行倒车。

盛夏酷暑，几只口干舌燥的狐狸来到一片葡萄园。一串串又大又紫、晶莹剔透的葡萄挂满枝头。众狐狸馋涎欲滴，急不可耐地急相跃起。无奈葡萄架太高，哥儿几个使尽浑身解数，葡萄依然可望不可及。

第一只狐狸跳了几下摘不到，从附近找来一个梯子，爬上去满载而归。

第二只狐狸跳了多次仍吃不到，找遍四周，没有任何工具可以利用，笑了笑说：“这里的葡萄一定特别酸！”于是，心安理得地走了。

第三只狐狸高喊着“下定决心，不怕万难，吃不到葡萄死不瞑目”的口号，一次又一次跳个没完，最后累死在葡萄架下。

第四只狐狸因为吃不到葡萄整天闷闷不乐，抑郁成疾，不治而亡。

第五只狐狸想：“连个葡萄都吃不到，活着还有什么意义呀！”于是找个树藤上吊了。

第六只狐狸吃不到葡萄便破口大骂，被路人一棒子了却性命。第

七只狐狸抱着“我得不到的东西也决不让别人得到”的阴暗心理，一把火把葡萄园烧了，遭到其他狐狸的共同围剿。

第八只狐狸想从第一只狐狸那里偷、骗、抢些葡萄，也受到了严厉惩罚。

第九只狐狸因为吃不到葡萄气极发疯，蓬头垢面，口中念念有词：“吃葡萄不吐葡萄皮„„”另有几只狐狸来到一个更高的葡萄架下，经过友好协商，利用叠罗汉的方法，成果共享，皆大欢喜！

关于心理防御机制，说法不正确的是？（）

A、心理防御机制能在一定程度上减轻个体的压力，有利于保持心理平衡

B、心理防御机制全都是起消极作用的

C、经常地使用消极的心理防御机制，可以使个体形成自卑、退缩的性格

D、未雨绸缪是一种积极的心理防御

某女性患者，30岁，哺乳期，牙龈出血伴低热半个月，经骨髓穿刺诊断为"急性淋巴细胞性白血病"，拟进行化学治疗。抗肿瘤药物的应用应遵循的原则是（）

A.权衡利弊，规避风险

B.目的明确，治疗适度

C.医患沟通，保护隐私

D.不良反应，果断处理

E.临床试验，积极鼓励