题目内容：

    I am the proud owner of three pet dogs. Over the years, I have watched their behaviours carefully that help me when I travel around the world.

One important lesson that my dog, Cody, taught me is how to deal with little problems in life. From his calm behavior when someone knocked unexpectedly at the door to the indifferent way he has dealt with his recent serious illness, he has always had the same easy-going attitude. This attitude is an important lesson to me in how I can face difficult situations when travelling, I've learned to try to handle bad situations calmly, such as when we miss a train? lose luggage? and so on.

Another dog of mine, Preston, loves to walk around the yard, spending hours smelling every place and finding out what it means to him. Taking it slowly is another lesson that's been very hard for me to learn. As an active traveller, I am actually experiencing less by speeding through everything, rather than slowly getting to know a place. Even if it means that you won't see as many things, going slowly when you travel is the only way to really get to know a new place. Rushing around a foreign city isn't fun at all.

My dog, Moya, came from a truly bad situation. I am not sure what happened to her before； I just know it wasn't good. And while she has become more relaxed over the years, she is still slightly on edge. She is very cautious when faced with any new situation. But once she's accustomed to her new surroundings, she is fine. She doesn't let fear influence her experience. The same can be applied to our travel experience. No matter where we go, we need to manage new situations with caution--while at the same time not letting that caution turn into fear.

Many thanks to my pets. Truly speaking, pets are as basic to American culture as hot dogs or apple pies. To Americans, pets are not just property, but a part of the family. After all, pets are people, too, with the help of whom I am able to gain a lot and live differently.

1.One of the three dogs, Cody,_______ .

A.once suffered from a serious illness

B.is excited when under pressure

C.enjoys walking around the yard

D.is unable to deal with new situations

2.From Preston, the author learned that one should ______.

A.pay attention to the details in life

B.try to see as many things as possible when travelling

C.stay indifferent to strangers

D.travel around slowly and have fun

3.The underlined phrase "on edge" in the fourth paragraph probably means “_____ ”.

A.hungry B.nervous C.calm D.angry

4.Which of the following best shows the structure of the passage?

A. B. C. D.