【正确答案】 B

【答案解析】[听力原文] 30-32 Coffee can be considered one of nature's greatest gifts.It gives mental and emotional clarity without harmful side effects,and it contains a wealth of nutrients.Yet,when most people drink coffee,they are not thinking that the beverage is improving their health.In fact,some may even feel a little guilty,since some believe coffee isn't good for you at all. The truth of the matter is: coffee,like anything else,can cause problems if too much is consumed.In the short-term,too much coffee will cause sleeping problems and hypertension.In the long-term,too much coffee will cause stomach problems as well as teeth staining. As far as the benefits,moderate consumption of coffee,which means 1 to 4 cups a day,provides your body with a wealth of antioxidants.These substances are responsible for eliminating free radicals.They are the chemical byproducts produced any time your body does something.A small number of them can help serve as a buffer against negative elements,but if they aren't kept in check,they can cause health problems.Antioxidants ensure that this doesn't happen. Even the caffeine content within coffee can be beneficial toward your health.One way it does this is by cleaning the water of your body's cells,which keeps your weight down while cleaning out impurities. [解析] 短文提到，有些人喝咖啡时会有负罪感，因为他们认为咖啡对人没有半点好处，故B正确。 [点睛] ①各选项主语都是They，内容多与喝咖啡的负面影响有关，由此可推测，问题可能问及“他们”对喝咖啡的看法。②A、C、D短文未提及，排除。

【正确答案】 B

【答案解析】[解析] 短文提到，长期过量喝咖啡会导致胃部和牙齿出现问题。B对应其中一个负面影响，故正确。 [点睛] 睡眠问题是短期过量喝啡导致的问题，A错误；C、D均未提及，排除。

【正确答案】 C

【答案解析】[解析] 短文提到，咖啡因对人体健康也有帮助，其中一个帮助在于它可以清洁细胞里的水分，故C正确。 [点睛] ①各选项均与It相关，根据选项关键词(improves,increases等)可推断，问题问及某物的功效。②A、B均未提及，排除；D是利用原词keeps...down设置的干扰项，也排除。