问答题：镜前有一发光点S经平面镜反射后通过点P，请在图中画出这条入射光线和反射光线．

题型：单项选择题

To Err Is Human by Lewis ThomasEveryone 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 title of the writing "To Err Is Human" implies that

A．making mistakes is confined only to human beings.

B．every human being cannot avoid making mistakes.

C．all human beings are always making mistakes.

D．every human being is born to make bad mistakes.

查看答案

题型：完形填空

小题1: Many people write on paper only one side. Why not try using both sides? Some students only use half the pages in their notebooks before getting new ones. Try to use up all the paper. People often give cards on festivals. How about trying to send e—mail instead?

小题2: There’s many poor families in China. You may ask your parents to keep your unwanted clothes. Then you can pass them to poor kids. You’ll feel happy that you are helping someone else. Also, you can see if your friend wants them before throwing them away.

小题3: In San Francisco of the US, there is a beautiful bridge. It cost more than four years to build it, and it was finished in 1937. You can cross the bridge by car or on foot, but you must pay. Do you know the bridge? Yes, it is the Golden Gate.

小题4: Many people can use computers, but few of them know how to use them correctly. Remember the following when you use your computer. Keep your computer in a cool, dry room; don’t put water or food near your computer; keep your screen clean and not too bright.

小题5: E—mail means messages sent from one computer to another. It is becoming more and more popular. You can send and receive e—mails everywhere. It is quick to use e—mails, and it is much cheaper than long—distance telephone call.