讲话中提到，当人们说他们爱他们的狗或者他们的狗爱他们的时候，这些人不是在开玩笑，但是 ，我们对狗和狗之间关系的本质却知之甚少。由此可知，人们对狗和狗之间关系的本质缺乏了解，所以选项A与讲话中所提到的内容一致，为正确答案。选项B 、C、D在讲话中均未提及，可排除。

【听力原文】

Passage Two

There's an endless amount of scientific data proving that dogs can develop strong bonds with their owners. People aren't kidding when they say they love their dog or their dog loves them, but were rather ignorant about the nature of the relationships that form between dogs.

In an effort to understand the matter further, I spoke with doctor Mark Beckhoff a researcher and former professor of animal behavior. The doctor's response to the question of whether or not dogs can fall in love like humans do was a straight “Of course!”. He went on to say that if love is defined as a long term commitment, meaning dogs seek one another out when they're apart, they're happy when they're reunited, they protect one another, they feed one another, they raise their children together. Then, of course, dogs love each other.

Now our furry friends don't really experience romantic love, like in the movies, but they can form deep and lasting bonds with their fellow dogs as well as humans. In fact, evidence shows that most dogs stay with one partner their whole lives. In actuality, love between dogs can be even more intimate than human relationships.

When they interact, they aren't afraid to smell each other and will express themselves clearly and honestly. Once again, it seems we have a lot to learn from dogs.

Questions 19 to 21 are based on the passage you have just heard.
Question 19. What does the passage say we don't know much about?
Question 20. What does Dr. Mark Beckhoff say about dogs?
Question 21. What does the speaker say about most dogs?

讲话中提到，当被问及狗狗是否能和人类一样坠入爱河时，博士直接回答：“当然!”他接着说，如果爱被定义为一种长期的承诺——这意味着狗狗们在分开的时候会互相寻找，团聚的时候会很开心 ，它们互相保护，互相喂食，一起抚养它们的幼崽——那么狗狗们当然就是彼此相爱的。因此，选项C与讲话中所表述内容一致，为正确答案。选项A 、B 、D在讲话中均未提及，可排除。

讲话中提到，事实上，有证据表明，大多数狗终生都和一个伴侣在一起，实际上，狗和狗之间的爱甚至比人和人之间的关系还要亲密。由此可知，选项D与讲话中的内容含义相符，是正确答案。选项A 、C在讲话中未提到，均可排除。讲话中提到，我们的毛茸茸的朋友们并不像电影里演的那样去经历真正浪漫的爱情，因此选项B与讲话中内容相反，故排除。