压线冲子的材质一般为（）。A.S45C B.CD65 C.SKD11 D.A6061

上皮细胞不典型增生指

A．细胞层次增多
B．上皮细胞异乎常态的增生
C．细胞异型性不明显，极性不丧失
D．细胞局限于基底膜内

近年来，我国各级政府在全国不断进行“打黄打非”工作，与此同时还广泛开展文化、文艺、科学技术下乡活动。我国之所以搞这些活动，从哲学上看是因为( )。

A．科学技术是第一生产力

B．社会主义现代化离不开精神文明建设

C．意识具有能动作用

D．科学理论能够指导实践，错误思想会把实践引向歧途

阅读理解

      There was a park near my home. But I didn't go there very often. Many people said there was nothing special. One afternoon I went into the park and found it was really small. I walked quickly because there

wasn't much to see. I walked for some time and found myself standing in front of two paths. __1__I found that the two paths were different from each other.

      The left one was wide and clean. There were lots of flowers on both sides of the path. Though the

flowers weren't very beautiful, they made me feel good. I decided to take this path. But wait!I looked at

the right one. The path didn't look nice. __2__Grass grew everywhere. For a long time I couldn't make

up my mind.

      __3__It wasn't nice,but I didn't want to give up. At last,I came to the end of the path. Ah!There was

a small garden there. It was beautiful,perhaps the most beautiful garden I had ever seen. __4__

      Many people told me that there was nothing much to see in the park. Now I'd like to tell them that if

they had followed the right way,they would have felt differently. But when I told them about what I had

seen in the park,they just smiled at me without saying a word. I knew they didn't believe me. They couldn't even remember that path because it was so small.

      __5__Don't be afraid to choose a different path. You may get a big surprise!

A.  There is nothing that I want to see.

B.  It looked like it had not been cleaned for months.

C.  After a while a strange feeling made me follow the dirty path.

D.  "Which way should I go?"I asked myself. I looked at one way,then the other.

E.  I told them what happened.

F.  My trip to the park that day made me understand something about life.

G.  There were trees,flowers and chairs. I thought it was the nicest part of the park.

学生的思想品德是在社会活动和 _________ 中逐步形成和发展起来的。

车辆在转弯时，（）能使两主动车轮转速不同，防止外轮所走路程长而产生轮胎的拖滑现象。

A、变速器

B、减速器

C、差速器