第5部分：補(bǔ)全短文(第46—50題，每題2分，共10分)

閱讀下面的短文，文章中有5處空白，文章后面有6組文字，請(qǐng)根據(jù)文章的內(nèi)容選擇5組文字，將其分別放回文章原有位置，以恢復(fù)文章原貌。請(qǐng)將答案涂在答題卡相應(yīng)的位置上。

Pain

All of us have felt pain. We have cut ourselves. We have been burned Or we have had headaches. Some of us suffer pain rarely pain rarely. (46)

Pain can take complete control of our body and mind, making it impossible to move and even to think. Yet we need pain. Without it, we would not know. If we have hurt ourselves. It is our body' s warning system. (47)

Pain is the most common reason we go to a doctor. It is the most common reason we take medicines. Until recently, however, most doctors knew of only a few drags that stopped some pains. (48) But new knowledge about the process of pain is helping them to control pain better.

Scientists have learned that the sense of pain is made up of both chemical and electrical signals. (49) Scientists also have learned that the nervous system sends two different kinds of pain messages to the brain: one very fast, the other slow. The first message is the warning signal. It moves at a speed of 30 meters a second In less than a second, the brain understands that part of the body is hurt and how badly it is injured (50) It tells us not to use the injured part until it heals.

A. And others have painful attacks all the time.

B. These signals travel from nerve cells in the injured area, up the spinal cord (脊髓) to the brain, and back down again.

C. It tells us that we are injured and should do something about it.

D. They knew little about the process of pain itself.

E. The other message moves at a speed of only 0. 13 meter a second.

F. And they send the second, slower message of pain to the brain.

（責(zé)任編輯：中大編輯）

共9頁(yè),當(dāng)前第5頁(yè)  第一頁(yè)  前一頁(yè)  下一頁(yè)