若抛物线y=ax2+bx+c经过点A(1,6),B(-5,6),则该抛物线的对称

题型:填空题

问题:

若抛物线y=ax2+bx+c经过点A(1,6),B(-5,6),则该抛物线的对称轴为(    )。

考点:二次函数的图像
题型:填空题

氯霉素的主要降解途径是

A.水解
B.氧化
C.异构化
D.聚合
E.脱羧

题型:填空题

阅读理解。

     On a rubbish run to work, I was greeted with a sight that made me both sad and angry. On the top of the

pile (堆) of rubbish sat a small dog. He was too high up to get down,and there was no way that he could have

climbed up by himself. He had been thrown out with the rubbish by some sick-minded person.

     I took him back to my workplace and then home with me. I didn't want to take him to the lost animal

society. However, later that evening, my boss heard that someone had lost their dog and gave them my

number. I was very surprised when the dog's owner phoned me.

     She came straight over to fetch him and was very thankful for what I'd done. The dog was sitting on an

electric blanket (毯子) happily playing with a ball when she arrived.

     Maybe she'd been putting her rubbish into bags and had left one on the floor. The little dog had jumped

in there,and without realizing where he was, she'd tied the bag and dropped it off at the collection point.

Luckily, he was able to find his way out somehow, and had found himself high up.

     It made me feel very silly for jumping to such a wrong conclusion. It was obvious (明显的) that she

loved her dog very much, and I felt sorry for what I'd been thinking about its owner all afternoon.

     Now I'm never sure that something happened in a certain way, no matter how obvious it appears. And

when I hear people drawing a conclusion without the facts, I tell them about the dog on the rubbish pile.

1. How did the dog come to the rubbish pile probably?

A. He was thrown there by his owner.

B. He climbed there on his own.

C. He was driven there by someone.

D. He followed the writer there.

2. The writer brought the dog home because _______.

A. she didn't know whose he was

B. she was waiting for the owner

C. she wanted to keep him home

D. she'd like to give him to the boss

3. What is the best conclusion we can draw from the story?

A. Everyone takes pity on lost animals.

B. There are really sick-minded people.

C. We should correct mistakes in time.

D. Facts must come before conclusions.

题型:填空题

下列叙述不正确的是(  )

A.铁表面镀锌,铁作阳极

B.船底镶嵌锌块,锌作负极,以防船体被腐蚀

C.钢铁吸氧腐蚀的正极反应:O2+2H2O+4e-=4OH-

D.工业上电解饱和食盐水的阳极反应:2Cl--2e-=Cl2

题型:填空题

(  )CPU不是由Intel公司生产的。

A.8086

B.80486

C.Pentium

D.K6

题型:填空题

我们既不能把书本上的个别论断当作束缚自己思想和手脚的教条,也不能把实践中已见成效的东西看成完美无缺的模式。这一观点符合()

①坚持两点论与重点论的统一

②辩证法的本质是批判的革命的和创新的

③坚持整体与部分的统一

④一切事物都是运动、变化和发展的

A.①③

B.②④

C.①②

D.③④

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