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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 drugs 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 one meter a second,
F. And they send the second, slower message of pain to brain.
答案及解析
46.A。文章第一段提到，我們都曾感覺過疼痛。從空格前一句的內容，即“有些人很少遭受疼痛之苦”，可以推斷空格處句子的內容應當與這一句的內容相反，即“另外一些人卻總是遭受疼痛的襲擊”。
47.C。空格前的句子講到，疼痛是我們身體的警報系統。因此接下來的句子應該說明這樣說的原因。
48.D。空格後一句講到，然而，有關疼痛過程的新知識使醫生得以更好地控制疼痛。由此可見，空格處句子的.內容應與此句內容相反，即醫生對疼痛過程瞭解得很少。
49.B。空格前一句中的“chemical and electrical signals”等詞語是對空格處句子的好提示。
50.E。文章第四段最後一句提到了“two different kinds ofpain messages”，而文章最後一段第一句中又用了“The first message”，顯然，空格處的句子應以“The other message”開始。
