What does the speaker recommend in this talk?

【精析】细节辨认题。讲座开头提到，到了复习准备考试和（提交）论文的时间了。压力很大，所以你想要利用一切可以得到的辅助来帮助自己提高记忆力和成绩。接着，句(1)中提到，作为一名营养学家，讲话者想说的是，吃得好可以对你的复习计划产生真实的影响，并自然引出接下来要讲述的内容：健脑食物和饮品。因此答案为D)。

What does the speaker warn against about coffee?

【精析】细节辨认题。句(2)中，讲话者明确指出，下午2点以后就不要再饮用咖啡了。因此答案为C

How can we get sufficient nutrients according to the speaker?

【精析】细节辨认题。句(3)中，讲话者说，食物应该始终排在补充剂之前，获得尽可能多的营养的关键是吃各种不同颜色的食物，如冷冻浆果和深绿色蔬菜等。最好是从食物和饮品中获得你需要的一切。由此可知，讲话者认为，我们可以通过丰富多样的饮食来获取充分营养。因此答案为B)。

听力原文：

It's revision time for exams and dissertations. The pressure is on, so you want all the help you can get to aid your memory and raise your grades.（1）As a nutrition expert, I want to say that eating well can make a real difference to your revision regimeso what brain-boosting food and drink would I recommend?

Coffee can have numerous benefits. However, while coffee may make you more alert, individuals can build up a tolerance, meaning this is short-lived. Coffee can also increase blood sugar and eventually cause lack of focus and energy. It's also worth noting that people react differently to coffee. Some people can drink it at midnight and go straight to sleep, whereas others get feelings of anxiety after a small amount. Also remember that coffee from a coffee shop may be stronger than coffee made at home. （2）So stop drinking coffee by 2 pm and have a maximum of 2 cups of coffee a day, but be aware of your own reaction to it. 

Whole grain foods will ward off hunger. Examples include porridge and whole wheat bread. Combining whole grain foods with protein will help keep your blood sugar levels balanced， which is essential for mood and concentration. Berries and nuts are a convenient and nutritious snack. Blueberries, like many dark colored fruits and vegetables, can slow down brain damage and age related decline. Frozen berries are also a good choice. They are usually cheap， last longer and don't lose their nutrients when frozen. But flavored and coated nuts are less healthy as they contain added oil, salt, and sugar.

Doctors often recommend taking vitamin supplements to top up on the nutrients you need.（3）But I would say food should always come before supplements and the key to getting as many nutrients as possible is to eat a varied diet with lots of different colors such as frozen berries and dark green vegetables. It's better to get everything you need from food and drink. For example, oranges contain not only vitamin C which boosts the immune system， but also fiber and other components that you can't get packaged together in a tablet.

Don't forget to drink a proper amount of water， which can boost attention by almost 25percent and can elevate your mood as well.

Finally, don't skip meals. Eating regularly will help keep blood sugar balanced and feed the brain with the fuel it needs.