题目内容：

Listening to audio books(有声读物) is a really terrific way to enjoy all kinds of books during those times of the day when stopping to sit down and read a book is not an option. An audio book gives the listener hours and hours of entertainment or instruction, or sometimes both at the same time. They are great for people of all ages and make a long road trip a more interesting experience, instead of being boring and dull.

The biggest benefit of an audio book is that it can be listened to anyplace and anytime. It is a favorite companion for people while they are traveling, commuting, exercising, shopping, working in the garden, or even dusting and vacuuming the house. Using headphones with your favorite audio book player allows you to listen to and absorb the information no matter what might be going on around you.

Even when you are in a situation that is quiet and are able to enjoy a good audio book, there are still advantages of using your headphones. You can often improve your retention(记忆力) and comprehension of the material when you use headphones because they help reduce distractions from other noises and help you focus better.

There are a number of different audio books these days that people can choose from. There are audio books on CDs, on audio cassettes(盒式磁带) and also as MP3s and any standard CD player, cassette recorder, or MP3 player that you might use to listen to music can function as an audio book player as well.

No matter which kind of audio book you prefer to listen to, there is an ever-increasing variety of works that you can select from these days. Virtually any subject matter that is contained in printed books will have at least some audio version available as well. However, books on audio cassettes are starting to become rarer.

1.What's the biggest advantage of listening to audio books?

A. It's convenient.

B. It makes traveling full of fun.

C. It allows people to listen with headphones.

D. It helps people to get concentrated.

2.We can infer from the last paragraph that______.

A. it's best to listen to audio books on audio cassettes

B. it's usually easy to get books on audio cassettes

C. printed books are out-of-date

D. it is worthwhile to keep books on audio cassettes

3.What does the underlined word “Virtually” in the last paragraph probably mean?

A. Almost.    B. Perhaps.

C. Unfortunately.    D. Regularly.