Question 21 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.

(21). What does the speaker suggest buying if you plan to stay camping in one place for more than a few days?

解析：C。本题目为细节题。问题为：如果你打算在一个地方露营超过几天，那么讲话人建议购买什么？根据原文“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.”可知如果计划在一个地方露营几天的话，可以买厨房设备，故正确答案选C。