What question does the speaker try to answer in this talk?

【精析】细节辨认题。讲座以面包的香味可以引发人们的久远记忆切入，引发了讲话者的问题为什么气味有时会引发强烈的记忆，特别是情感记忆？之后，讲话者一直在试图回答这一问题。因此答案为A)。

What is said to result in an intimate connection between emotions,memories and scents?

【精析】细节辨认题。句(2)中提到，气味是唯能直达大脑情感和记忆中心的感觉。它引发了情感、记忆和气味之间的密切联系，这就是气味引发的记忆比景象或声音引发的记忆更有感染力的原因。因此答案为D)。

What does the brain use to give meaning to information and find a memory?

【精析】细节辨认题。句(3)中提到，大脑是利用情境来赋予信息意义并找到记忆的。因此答案为D)

What drawback do memories of scents share with other memories?

【精析】细节归纳题。句(4)中提到，尽管气味带来的记忆具有特殊性，但它们与其他记忆有着相同的缺点。它们并不总是准确的，而且会随着时间的推移而变化。因此答案为A)。

听力原文：

We all know that the sense of smell is powerful. The delicious scent of bread, for example, can act like a time machine. One sniff can bring back a memory from many years ago. Indeed, scent particles, in general, can revive memories that have been long forgotten.（1）But why do smells sometimes trigger powerful memories, especially emotional ones? The short answer is that the brain regions that handle smells,memories and emotions are linked.

A scent is a chemical particle that floats in through the nose and into the region of the brain responsible for smell， where the sensation is first processed into a form that the brain can read. Brain cells then carry that information to the area of the brain where emotions are processed, and then to an adjacent area of the brain where learning and memory formation take place.

（2）Scents are the only sensations that travel such a direct path to the emotional and memory centers of the brain. That results in an intimate connection between emotions, memories and scents, which is why memories triggered by scents are experienced as more emotional than those triggered by sight or sound.

Let's take a closer look at how those memories are activated. Usually, when a person smells something that's connected to a meaningful event in their past,they'll first have an emotional response to the sensation and then a memory might follow. But sometimes, the memory doesn't come to the surface. The person might feel the emotion of something that happened in the past but won't remember what they experienced. What causes this baffling phenomenon? The explanation is context. Imagine this scenario-a person is walking down the street smelling a scent that they first encountered decades ago, which activates an emotional response. If the person had first come across that smell in a very different context, it will be much more difficult to recover the associated memory,（3）because the brain uses the context to give meaning to the information and find that memory.

（4） The special nature of memories brought back by scents notwithstanding, they have the same drawbacks as other memories.  They aren't always accurate, and they can change over time. In fact, each time we remember something,that memory can become distorted. But, because of the strong emotional associations these memories evoke, people who remember something due to a scent are often convinced that the memories are accurate, even when they aren't.