题目内容：
根据下列内容，回答题。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 hastbund a new。eclPe of success According to the study，if the cat is adopted before the dog，and ifthey areintroduceQ when still young less than 6 months for cats，a year for dogs)，it is highly probable that the two pets will get along swimmingly．Two-thirds of the homes interviewed reDortej 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 l0%of the homes．0ne reason for this is probably that some of their body signals are 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 behavior．They are learning how to talk each other’s language．It is a surprise that cats can leam 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．Theycan learn how to read each other’s body signals，suggesting that the two may have more in com．mon than we previously suspected．Once familiar with each other’s presence and body language，cats and d098 can play together，greet each other nose to nose，and enjoy sleeping together on thesofa.They can easily share the same water bowl and in some cases groom(梳理)each other．
The significance of the research on cats and dogs may go beyond pets—to people who don，tget alon9g，including neighbors，colleagues at work，and even world superpowers．If cats and dogs can learn to get alon9，surely people have a good chance．
The underlined word swimmingly in Paragraph l is closest in meaning to__________． A．early
B．sweetly
C．quickly
D．smoothly
参考答案：
答案解析：