第二部分阅读（共两节，满分50分）
第一节（共15小题；每小题2. 5分，满分37. 5分）
阅读下列短文，从每题所给的A、B、C、D四个选项中选出最佳选项。
A
All dogs can benefit from training throughout their lives. But where to begin the process? Thus, we have consulted some experts on where to start. Here's what they say.
Identify your training goals
There are two levels of dog training. If you're interested in skill training, or basic manners, such as teaching your dog to sit, stay and lie down, that's the field of a dog trainer. If your dog hasa behavior problem—anxiety, aggressiveness, fearfulness—then what you need is a dog behavioralconsultant.
Be realistic
Your dog may bark at your guests, which might be a kind of dog that has been selected forhundreds of years to defend against people walking in your front door. Since you can't change a German shepherd＇s genetic impulse(基因冲动) to defend its territory, you may need to change yourexpectations, instead.
Decide how you'd like to train your dog
When it comes to training methods, you have a few options. Group classes are cheaper but lesspersonalized, while board and training facilities are more expensive and riskier. Your choice willdepend on your budget and your training goals. If you don't want to pay a lot of money for dog training, you can choose free or low-cost resources you can find online.
Understand the methods
Generally speaking, many trainers fall into two broad categories: The first is positive reinforcement(强化)trainers，which means giving your dog something good to train. The second is balancedtrainers who are willing to make incorporate corrections, which means using positive reinforcementmethods.
Click here to get more information to train your dogs.
21. Who should you ask if your dogs are aggressive?
A. A dog behavioral trainer. B. A dog behavioral consultant.
C. A reinforcement trainer. D. A balanced trainer.
22. What's the benefit if your dog attends the group classes?
A. It can socialize better. B. It can learn more skills.
C. You can save money. D. You can build stronger bonds with it.
23. Where does the text most likely appear?
A. On a website. B. In a story book.
C. In a pet brochure. D. In a biological study.