5. What limitations are mentioned that could affect the results of the study?

There may be a difference between dog owners and non-owners that existed before the dog was obtained. It’s also possible that people who tend to buy dogs are also generally more active.

2. 请在不参考课文的情况下完成下列练习。选择一个意思合适的单词填入句子的空格处。

1. That dog doesn’t have an owner so come away immediately. Can’t you see it’s a stray? It might have a disease.

2. Quickly, nurse. He’s going into cardiac arrest. Get me the defibrillator.

3. He won’t bite, but he doesn’t like being touched. It’s down to his last owner, who used to beat him.

4. How can you not see it? There’s a marked difference between the first picture and the second!!

5. Please stop smoking, son. It goes hand-in-hand with cancer and you don’t want that.

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