Dogs are very sociable（合群的） animals．When owners go out and leave their dogs alone，the dogs get worried and upset．Dogs should be trained to be their own while still young instead of when they are older and set in their ways．When owners are not around，they should provide some toys for their dogs to play with．Leaving the radio or television turned on might also provide relaxing background noise．

Howling（嚎叫） is a form of communication．Dogs do it to tell one another where they are．Some dogs howl when they are lonely，while others do it when greeting strangers whom they are seeing for the first time．Some even howl to music and do this because it is fun．

When it comes to training dogs，giving rewards（奖赏） is a far better way than using punishment．Food makes an excellent reward，and if they do not respond（反应） to this，owners should try touching．Dogs like being touched by owners very much．Words of praise work well too，but not as well as food or touch．It helps if owners spend more time with their dogs．

（1）When should dogs be trained to be on their own？　　

A．When they are born．

B．When they are young．

C．When they are worried．

D．When they are older．

（2）Why should the owners leave the television turned on when they are not at home？　　

A．Because they think their dogs like watching TV．

B．Because they think watching TV helps to train dogs．

C．Because they want to make their dogs feel less worried．

D．Because they want their dogs to learn some skill from TV programs．

（3）What is the second paragraph of the passage mainly about？　　

A．Dogs howl to music．

B．Dogs howl to tell where they are．

C．Dogs howl to communicate．

D．Dogs howl to show they are lonely．

（4）According to this passage，which of the following isn't a good way to train dogs？　　

A．Punishing the dogs．

B．Spending more time with the dogs．

C．Giving rewards to the dogs．

D．Giving words of praise to the dogs．