Question 4 is based on the news report you have just heard.

News Report Two

          Long queues, delayed flights and overcrowding at airports have become almost as much a topic for conversation in Britain as the traditional complaining about the weather. Meanwhile there are complaints that poor service in London’s major airports is discouraging foreigners from doing business in Britain. Much of the criticism is directed at the British Airports Authority which runs seven major airports, including the three main ones serving London. （3）The Competition Commission is now to investigate whether the British Airports Authority needs to sell off some of its assets. The idea is the competition between rival operators would lead to better service at airports. The British Airports Authority, recently bought by a Spanish company, says the root cause of the problem is not the ownership structure （4）but a lack of runway and terminal capacity which is addressing through a program of heavy investment.

4. What is the root cause of the poor service at British airports according to the British Airports Authority?

本题是原文重现，问题问导致英国机场服务差的原因，原文中有提到不是因为所有制结构而是缺乏跑道和机场客容量，“a lack of runway and terminal capacity”，故正确答案为 D。