悬臂式掘进机按掘进对象可分为（）种。A、一； B、二； C、三； D、四.

接种环采用的消毒除菌方法是（）

A.灼烧法

B.压力蒸汽灭菌法

C.紫外线消毒法

D.干热灭菌法

E.过滤除菌法

国际货币基金组织贷款均按照（）

A、美元计值

B、英镑计值

C、特别提款权计值

D、贷款对象的货币计值

液压机压接时应遵守的规定，液压机启动后先检查各部位运行情况，正常后方可使用。（）

A、试验

B、满负荷试验

C、空载运行

D、安全

《局大风沙害天气突发事件应急处理预案》要求，工务部门负责检查和掌握线、桥设备状态，对（）和路基的病害进行检测。

A、桥梁

B、线路

C、隧道

Questions 51-55 are based on the following passage.

To Err is Human

by Lewis Thomas
Everyone must have had at least one personal experience with a computer error by this time. Bank balances are suddenly reported to have jumped from $ 379 into the millions, appeals for charitable contributions are mailed over and over to people with crazy sounding names at your address, department stores send the wrong bills, utility companies write that they’re turning everything off, that sort of thing. If you manage to get in touch with someone and complain, you then get instantaneously typed, guilty letters from the same computer, saying, "Our computer was in error, and an adjustment is being made in your account."
These are supposed to be the sheerest, blindest accidents. Mistakes are not believed to be the normal behavior of a good machine. If things go wrong, it must be a personal, human error, the result of fingering, tampering a button getting stuck, someone hitting the wrong key. The computer, at its normal best, is infallible.
I wonder whether this can be true. After all, the whole point of computers is that they represent an extension of the human brain, vastly improved upon but nonetheless human, superhuman maybe. A good computer can think clearly and quickly enough to beat you at chess, and some of them have even been programmed to write obscure verse. They can do anything we can do, and more besides.
It is not yet known whether a computer has its own consciousness, and it would be hard to find out about this. When you walk into one of those great halls now built for the huge machines, and standing listening, it is easy to imagine that the faint, distant noises are the sound of thinking, and the turning of the spools gives them the look of wild creatures rolling their eyes in the effort to concentrate, choking with information. But real thinking, and dreaming, are other matters. On the other hand, the evidence of something like an unconscious, equivalent to ours, are all around, in every mail. As extensions of the human brain, they have been constructed the same property of error, spontaneous, uncontrolled, and rich in possibilities.

The author compared the faint and distant sound of the computer to the sound of thinking and regarded it as the product of ______.

A. dreaming and thinking

B. some property of errors
C. consciousness


D. possibilities