【正确答案】 D

【答案解析】[听力原文]
Can dogs and cats live in perfect harmony in the same home? A recent research has found a new recipe of success. According to the study, if the cat is adopted before the dog, and if they are introduced when still young, it is highly probable that the two pets will get along peacefully.
However, it wasn"t all sweetness and light. There was a reported coldness between the cat and dog in 25% of the homes, while aggression and fighting were observed in 10% of the homes. One reason for this is probably that some of their body signals were just opposite. For example, when a cat turns its head away it signals aggression, while a dog doing the same signals submission.
In homes with cats and dogs living peacefully, researchers observed a surprising behaviour. They are learning how to speak each other"s language. It is a surprise that cats can learn how to talk "dog", and dogs can learn how to talk "cat".
What"s interesting is that both cats and dogs have appeared to develop their intelligence. They can learn how to read each other"s body signals. Once familiar with each other"s presence and body language, cats and dogs can play together, greet each other nose to nose, and enjoy sleeping together on the sofa.
The significance of the research on cats and dogs may go beyond pets — to people who don"t get along, including neighbours, colleagues at work, and even world superpowers. If cats and dogs can learn to get along, surely people have a good chance.

When may some cats and dogs fight according to the speaker?

[解析] 短文中提到10%的家庭中的猫和狗会发生aggression and fighting，接着说明一个可能的原因：some of their body signals were just opposite，并举猫和狗扭头表示截然相反的信号的例子进行说明。由此可推断，当猫和狗误解了彼此发出的信号时，就有可能会发生争斗，故答案为D。
原因处和举例处常设为考点，听音时应留意。