问答题 In this question, you will read a short passage, then listen to a lecture on the same topic, and then speak in response to a question about what you have read and heard. After you hear the question, you have 30 seconds to prepare your response and 60 seconds to speak.
Read the following information from a textbook.
DEHYDRATION

Dehydration is the condition in which body water output exceeds water input. Dehydration may develop with either water deprivation or excessive water loss. Symptoms include thirst, dry skin and mouth, rapid heartbeat, low blood pressure, weakness, exhaustion, and delirium. If not corrected, dehydration will end in death. When water intake is inadequate, the blood becomes concentrated. The mouth becomes dry, and the brain initiates drinking behavior. The first signal is thirst. Thirst drives one to seek water, but lags behind the body's need because by the time thirst is felt the body has already lost some of its water.
Now cover the passage and listen to the recording. When you hear the question, begin preparing your response.
Explain dehydration and how the example given by the professor illustrates the condition.
【正确答案】Key points: Dehydration is the condition in which too much water is lost from the body and not replaced. The professor gives the example of a woman who had symptoms of dehydration, but failed to notice. The woman was too busy to notice thirst, which is the first sign of dehydration. The woman also experienced weakness, confusion, fast heart rate, and low blood pressure, which are all symptoms of dehydration. Her condition improved when she received fluids. (3.6, 3.7, 3.10) [听力原文] When too much water is lost from the body and not replaced, dehydration develops. This can happen more easily than you think. It happened to a patient in the clinic yesterday. When the body loses fluid, we feel thirsty. If we don't drink fluid or, as in the case of many elderly people, we fail to perceive the thirst message, the symptoms of dehydration can move quickly from thirst to weakness and exhaustion. This is what happened to our patient yesterday, and she wasn't even elderly. She was a busy professional woman in her thirties. She was having a very hectic day and simply forgot to drink. She was too distracted by all her responsibilities to notice that she was thirsty. And then she skipped lunch. Late in the afternoon, she became aware that she didn't feel well, but she ignored the symptom and kept going. By the time a co-worker brought her into the clinic, the woman felt weak and confused. She had difficulty walking without assistance. Her heart rate was fast and her blood pressure low. She was in serious trouble. But once we put her on intravenous fluids, her condition quickly improved. We found no other serious problem, so she was able to go home after a few hours. Explain dehydration and how the example given by the professor illustrates the condition.
【答案解析】