题目

动脉血流经心脏及其相关血管时，正确的流动途径是（ ）A． 肺动脉→右心室→右心房         B． 主动脉→右心房→右心室C． 肺静脉→左心房→左心室         D． 主动脉→左心室→左心房 答案：C．Can dogs and cats live in perfect harmony in the same home? People who are thinking about adopting a dog as a friend for their cats are worried that they will fight. 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 (less than 6 months for cats, a year for dogs), it is highly probable that the two pets will get along well. Two-thirds of the homes interviewed reported a positive relationship between their cat and dog.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 means giving up.In homes with cats and dogs living peacefully, researchers observed a surprising behaviour. They are learning how to talk 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 to read each other’s body signals, suggesting that the two may have more in common than was preciously suspected. 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 in the sofa. They can easily share the same water bowl and in some cases groom(梳理) each other.The significance of this research on cats and dogs maygo beyond pets----to people who don’t get along, including neighbors, colleagues at work, and even world superpowers. If cats and dogs can learn to get along, surely people have a good chance.【11】Some cats and dogs may fight when_________.A. they are cold to each otherB. they look away from each otherC. they misunderstand each other’s signalsD. they are introduced at an early age【2】What is found surprising about cats and dogs?A. They eat and sleep togetherB. They observe each other’s behaviorsC. They learn to speak each other’s languageD. They know something from each other’s voice【3】It is suggested in paragraph 4 that cats and dogs_______.A. have common interestsB. are less different than was thoughtC. have a common body languageD. are less intelligent than was expected【4】What can we human beings learn from cats and dogs?A. We should learn to live in harmonyB. We should knows more about animalsC. We should live in peace with animalsD. We should learn more body languages