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. (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.1f 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 013~meter a second.
F And they send the second，slower message of pain to the brain.
分析選項：
A And others have painful attacks all the time.
其他人總是受到疼痛攻擊。
B These signals travel from nerve cells in the injured area，up the spinal cord(脊髓)to the brain，and back down again.
這些信號從受傷的神經(jīng)細胞開始出現(xiàn)，來到大腦的
C It tells us that We are injured(受傷的) and should do something about it
D They knew little about the process of pain itself.
關于疼痛的過程他們知之甚少。
E The other message moves at a speed of only 013~meter a second.
另一個信息每秒鐘以13米的速度運行
F And they send the second，slower message of pain to the brain.
他們送出第二個，緩慢的疼痛的信息傳給大腦。
All of us have felt pain.We have cut(割破) ourselves.We have been burned(火燒).Or we have had headaches.Some of us suffer pain rarely(很少). (46)
分析：本段的意思是：我們都曾感覺過疼痛。從空格前一句的內(nèi)容，即“有些人很少遭受疼痛之苦”，可以推斷空格處句子的內(nèi)容應當與這一句的內(nèi)容相反，即“另外一些人卻總是遭受疼痛的襲擊”。所以選擇A。
Pain can take complete control of (完全控制)our body and mind(思想)，making it impossible to move and even to think.Yet we need pain.Without it(如果沒有疼痛)，we would not know.1f we have hurt ourselves.It is our body’s warning system(警報器). (47)
分析：空格前的句子講到，疼痛是我們身體的警報系統(tǒng)。因此接下來的句子應該說明這樣說的原因。 所以選C。
Until recently(直到最近)，however, most doctors knew of only a few drugs(只有幾種藥物) that stopped(阻止) some pains (48) But new knowledge about the process of pain is helping them to control pain better.
分析：空格后一句講到，然而，有關疼痛過程的新知識使醫(yī)生得以更好地控制疼痛。由此可見，空格處句子的內(nèi)容應與此句內(nèi)容相反，即醫(yī)生對疼痛過程了解得很少。 所以選D。
Scientists have learned(知道) that the sense of pain(疼痛感) is made up of (由。。。組成)both chemical (化學的)and electrical (電子的)signals(信號). (49)
分析：空格前一句中的“chemical and electrical signals”等詞語是對空格處句子的很好提示。 所以選擇B，These signals travel from nerve cells in the injured area，up the spinal cord(脊髓)to the brain，and back down again.
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)
分析： 第一句提到了“two different kinds of pain messages”，緊接其后又出現(xiàn)了：“The first message”，顯然，空格處的句子應以“The other message”開始。所以選E。
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.1f 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 013~meter a second.
F And they send the second，slower message of pain to the brain.
分析選項：
A And others have painful attacks all the time.
其他人總是受到疼痛攻擊。
B These signals travel from nerve cells in the injured area，up the spinal cord(脊髓)to the brain，and back down again.
這些信號從受傷的神經(jīng)細胞開始出現(xiàn)，來到大腦的
C It tells us that We are injured(受傷的) and should do something about it
D They knew little about the process of pain itself.
關于疼痛的過程他們知之甚少。
E The other message moves at a speed of only 013~meter a second.
另一個信息每秒鐘以13米的速度運行
F And they send the second，slower message of pain to the brain.
他們送出第二個，緩慢的疼痛的信息傳給大腦。
All of us have felt pain.We have cut(割破) ourselves.We have been burned(火燒).Or we have had headaches.Some of us suffer pain rarely(很少). (46)
分析：本段的意思是：我們都曾感覺過疼痛。從空格前一句的內(nèi)容，即“有些人很少遭受疼痛之苦”，可以推斷空格處句子的內(nèi)容應當與這一句的內(nèi)容相反，即“另外一些人卻總是遭受疼痛的襲擊”。所以選擇A。
Pain can take complete control of (完全控制)our body and mind(思想)，making it impossible to move and even to think.Yet we need pain.Without it(如果沒有疼痛)，we would not know.1f we have hurt ourselves.It is our body’s warning system(警報器). (47)
分析：空格前的句子講到，疼痛是我們身體的警報系統(tǒng)。因此接下來的句子應該說明這樣說的原因。 所以選C。
Until recently(直到最近)，however, most doctors knew of only a few drugs(只有幾種藥物) that stopped(阻止) some pains (48) But new knowledge about the process of pain is helping them to control pain better.
分析：空格后一句講到，然而，有關疼痛過程的新知識使醫(yī)生得以更好地控制疼痛。由此可見，空格處句子的內(nèi)容應與此句內(nèi)容相反，即醫(yī)生對疼痛過程了解得很少。 所以選D。
Scientists have learned(知道) that the sense of pain(疼痛感) is made up of (由。。。組成)both chemical (化學的)and electrical (電子的)signals(信號). (49)
分析：空格前一句中的“chemical and electrical signals”等詞語是對空格處句子的很好提示。 所以選擇B，These signals travel from nerve cells in the injured area，up the spinal cord(脊髓)to the brain，and back down again.
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)
分析： 第一句提到了“two different kinds of pain messages”，緊接其后又出現(xiàn)了：“The first message”，顯然，空格處的句子應以“The other message”開始。所以選E。