问题补充：
When we talk about the climate（气候）of the UK, you may think of f 1London and rainy weather. Actually, after many years, London is not as foggy as it used to be because the government is trying their best to solve the p 2of air pollution, which is the major(主要的) r 3of the thick fog in London.
However, it is t 4that it often rains in the UK and the weather always changes quickly. Maybe you wish to play tennis with your friend after work when you see the beautiful sunshine in the morning, but suddenly the wind comes and it r 5when you go to work.
The difference in temperature b 6winter and s 7 is not so great in the UK as in China. The average（平均的）t 8 for winter is about 4.5℃, and for summer about 15.5℃.
And the best time to visit the country is in summer. It is often s 9 and you can enjoy outdoor sports and have a picnic h 10in such weather. foggy
答案：
(答案→)foggy
解析：
【小题1】此题考查形容词，foggy London，伦敦是雾都
【小题2】此题考查名词，环境污染问题。
【小题3】此题考查名词，the major reason表示最主要的原因。
【小题4】此题考查形容词，it is true that表示事实表明。
【小题5】此题考查动词，it是第三人称单数，故用rains。
【小题6】此题考查介词，between…and…表示两者之间。
【小题7】此题考查名词，根据语境可知夏天和冬天的天气变化在英国不如在中国大。
【小题8】此题考查名词，根据语境可知说的是温度。
【小题9】此题考查形容词，根据下文you can enjoy outdoor sports and have a picnic…可知选择sunny。
【小题10】此题考查副词，表示开心，故用happily。
