计算机系统由______组成。A．主机和显示器 B．微处理器和软件 C．硬件系统和应

阅读理解

       Dogs are friends of man. They work for us. They hunt (狩猎) with us. They play with us. But once,

all over the world, dogs are wild (野生的).

       Dogs go back to the Stoen Age. All dogs had the same ancestor(祖先). It is believed that this

ancestor was much like a wolf (狼). Other animals like the fox, came from this ancestor, too.

       Thousands of years ago, man began to tame (驯服)the wild dogs . When the dogs were tame, they

were trained (训练). The strong dogs became working animals . They were trained to pull heavy loads

(担子). They learned to keep watch over the sheep and other animals. Working dogs had other jobs, too.

       Some dogs were not strong. But they could help man hunt for game. Other dogs were best as pets.

       At first , there were only a few kinds of dogs. Today there are more than 100 kinds.

( )1. The word in the story that means an animal far bac k in another animal's family is

ancestor.                                                                                              

( )2. The story make us believe that Man has helped change animals.       

( )3. The strong dogs turned into foxes.            

( )4. Dogs are pets from the beginning.                

( )5. Dogs and man have been friends for a long time.             

我国先后批准设立了九大综合配套改革试验区,综合配套改革试验区以“改革”为内容,改革是社会主义的自我完善与自我发展。改革的根本目的是(　　)。

①使生产关系适应生产力的发展　            ②使上层建筑适应经济基础的发展　

③实现全体人民的共同富裕　                ④满足人民的物质文化生活的需要

A．①②

B．③④

C．②③

D．①③

汽轮机滑销系统的作用完全是为了保证汽缸受热时能自由膨胀。

在为颌骨缺损的患者进行口腔检查时，下列说法中不正确的是（）

A.由于颌骨缺损后修复体的固位常存在一定的困难，故对余留牙一般均采用尽量保留的原则

B.龋齿应及时做充填治疗，必要时做人造冠保护

C.对牙槽骨吸收Ⅱ°以下的残根，均应尽可能保留，经过完善的根管治疗后，做桩核人造冠修复

D.对Ⅱ°或Ⅲ°以下松动牙，有利于固位者也应考虑保留

E.Ⅲ°松动牙，有利于固位者也应考虑保留

属于计量收发差错和管理不善等原因造成的存货短缺或毁损，应先扣除残料价值、可以收回的保险赔偿和过失人的赔偿，然后将净损失记入营业外支出。 ( )