Question 20 is based on the passage you have just heard.

     Today I’m going to talk about tents. (19) Camping is still one of the cheapest ways of having a holiday. And each year, over three million people take camping vacations, either here in Britain or abroad, mostly on the Continent. Obviously, camping can't be as comfortable as living in a permanent house,but modem tents can be very comfortable indeed, with windows, bedrooms, kitchens and sitting-rooms. (20) The most popular tent sold in Britain is the frame tent with two bedrooms and sleeping accommodation for four people. There is usually an outer tent of water-proof fabric and a lighter inner tent or tents with a built-in groundsheet. The outer tent fits over the framework. This is made of metal poles which are fitted together. The inner tent is attached to this frame.Generally, the inner tent is about half the area of the outer tent The other half of the outer tent is the living area This doesn’t usually have a groundsheet,but you can buy one to fit, though it costs extra. The ordinary four-bed frame tent doesn’t usually have a separate kitchen area» but the larger ones often do. (21) You can buy a kitchen extension for many tents, and it’s worth buying one if you plan to stay camping in one place for more than a few days.

(20). What does the passage tell us about the most popular tent sold in Britain?

解析：B。本题目为细节题。问题为：这篇文章告诉我们关于英国最受欢迎的帐篷哪些信息？根据原文“The most popular tent sold in Britain is the frame tent with two bedrooms and sleeping accommodation for four people. There is usually an outer tent of water-proof fabric and a lighter inner tent or tents with a built-in groundsheet.”可知帐篷的外层具有防水的纤维结构，里层是较轻的帐篷或内置防潮布的帐篷，故正确答案选B。