下面文章有5处（第61至65题）需要添加小标题。请从以下选项（A、B、C、D、E和F中选出符合各段意思的小标题，并在答题纸上将相应的标号涂黑。选项中有一项是多余选项。
Humans and dogs have been working together for thousands of years, and some scientists even believe the two species have been living with one another for thousands of years． While having a dog will not improve your health if you never wanted a dog in the first place, dog lovers can benefit from living with them．
【小题1】
Most of us know the benefits of exercise, but it can be a struggle to find the motivation to get up and get moving everyday． A dog provides strong motivations, and can make your daily walk or run less lonely and more fun．Moreover, you'll bum extra calories when helping your dog walk and doing brief training exercises with your dog． For some people, going for walks alone is scary, but a dog can make runs and walks feel more secure．l know that with Ranger．I have to walk him every day, and he's always ready each morning．Sometimes we even have an afternoon or early evening walk, which is better for my health．
【小题2】
There's no doubt that dog ownership does e with some stresses, from making sure you've applied their weekly bath to worrying if your dog will get along with the other dogs at the dog park． But the benefits of pet ownership more than outweigh these small stresses． Research shows that a few minutes spent petting an animal． lowers blood levels of the stress hormone, which contributes to tiredness, weight gain and aging, and your pet can help kill its negative effects． A few minutes playing with your dog every day also releases powerful ¨feel-good hormones that continue to function in the bloodstream．
【小题3】
Many people living alone worry about thieves, and a dog can help give owners a sense of security． Thieves are less likely to break into a house with a barking dog, and your dog can help you feel less lonely whether you're just spending the night by yourself or living alone long-term．If your dog is older and struggles to move around, you can still rest easy knowing that your dog will get to a robber before you do．
【小题4】
People who have regular positive interactions with others tend to live longer and be happier, and pets provide you with a valuable opportunity to meet and interact with other people． Even if you're shy, it's easy to strike up a conversation with another person if you're both talking about your animals． Visits to the dog park and meet--ups with other pet owners also provide pet owners with opportunities for interactions．If you're still anxious about meeting new people, consider joining a message board or online group for people with similar pets to yours． You'll quickly find yourself making new friends in addition to learning a lot about your best friend - your pet!
【小题5】
In a fast-paced, high-stress world, depression and anxiety are at an all-time high． But pet owners have fewer mental illnesses, and animals are even used as treatment for people suffering from mental illness． If you struggle with depression, an animal can help you avoid such problems． The exercise and stress release you get from spending time with your pet may even reduce the effects of depression． Dog owners are also less stressed than people who don't own dogs, and reduced stress is strongly related with lower blood pressure, a longer life span, greater happiness and improved health．B
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(答案→)B
解析：本文提到人与动物相处了很多 年，实验表明宠物能帮助主人很多，比如多锻炼，减压，增加安全感，增加人际交往，减少心理疾病。
【小题1】B 根据第二段第一句话提到Most of us know the benefits of exercise, but it can be a struggle to find the motivation to get up and get moving everyday许多人知道锻炼的益处，但是找到动机起床并运动却是一种挣扎，所以这段讲述鼓励多锻炼，故选B项。
【小题2】D 根据第三段所提到的Research shows that a few minutes spent petting an animal． lowers blood levels of the stress hormone, which contributes to tiredness, weight gain and aging, and your pet can help kill its negative effects．研究表明与狗度过一段时间，能降低血压，有助于减少劳累，你的宠物能减少负面影响，故选D项。
【小题3】C 根据第四段提到Many people living alone worry about thieves, and a dog can help give owners a sense of security许多人与狗住，能帮助主人增加安全感 ，故选C项。
【小题4】E 根据第五段的提到People who have regular positive interactions with others tend to live longer and be happier, and pets provide you with a valuable opportunity to meet and interact with other people．经常与他们联系的人，会活得更长久，快乐，宠物能提供你更多与人沟通的机会，故选E项。
【小题5】F 根据第六段提到But pet owners have fewer mental illnesses, and animals are even used as treatment for people suffering from mental illness．宠物的主人几乎很少有心理疾病，动物有助于减少心理疾病，故选F项。