【正确答案】 A

【答案解析】[听力原文]
Today"s lecture is about a chemical you may regret you used, probably on the weekend—I"m talking of course about alcohol.
Well, many of you are very familiar about how to use it but how much do you know about it? Well, alcohol is a depressant, meaning it slows down the activity of your central nervous system by replacing the water around the nerve cells in your body. When you drink an alcoholic beverage, your body absorbs about 90% of the alcohol in the drink. On average, a normal liver can process 10 grams of alcohol per hour. That is the equivalent of a glass of wine. Alcohol also changes the density of the fluid and tissues in the part of your ears that control your sense of balance. That"s why it can be difficult to walk, or even stand up, when you"ve had too much to drink. Why do we feel bad in the morning? Now we have to get a little technical. Your liver processes alcohol into a toxic chemical called acetaldehyde (乙醛). Just as the alcohol made you feel good, or at least drunk, the acetaldehyde makes you feel bad. It causes your blood vessels to dilate—which makes you feel warm, and gives you a headache. Meanwhile, the alcohol still in your system is raising both your pulse and blood pressure—which makes the headache even worse. And then there"s the effect on your kidneys. When you"re sober, your kidneys use a chemical called vasopressin to recycle the water in your body. But alcohol reduces the level of vasopressin in your blood. So, instead of recycling water, you urinate it out. That makes you dehydrate, which can make you feel worse, what we call a hangover (宿醉). So, if you really want to reduce some of the effects of a hangover you can drink a lot of water before you go to bed.

How does the professor explain why we feel so bad after we drink too much?

[解析] 细节题。录音中提到“Why do we feel bad in the morning?”接着给出了解释：酒精在人体产生一种有毒化学物乙醛，乙醛使血管扩张，导致头疼；提高脉搏和血压，加重头疼；减少抗利尿激素，导致脱水。一系列因素的积累导致喝酒后人们会感觉很不舒服。

【正确答案】 B

【答案解析】[听力原文]
According to the speaker, which part of your body controls your balance and is affected by alcohol?

[解析] 细节题。录音中提到，酒精会改变控制平衡感的耳部周围的液体和组织密度。

【正确答案】 A

【答案解析】[听力原文]
What does the author attribute dehydration to?

[解析] 细节题。录音中提到，酒精使得水分被排除了体外，而没有通过肾脏进入人体循环系统，导致了脱水，使人们感觉更加不舒服。即脱水的原因是水分没有在。肾脏中再次循环。

【正确答案】 D

【答案解析】[听力原文]
What makes the headache even worse?

[解析] 细节题。根据录音，仍然在循环系统中的酒精会提高脉搏和血压，加重头疼。

【正确答案】 C

【答案解析】[听力原文]
What does the professor suggest people do if they have a hangover?

[解析] 细节题。录音最后提到，如果想要减轻宿醉的效果，睡前最好喝很多水。