题目：
Concorde’s Birthday CONCORDE, the world’s fastest passenger plane, will soon be over 33 years old. It first __1__ on 2 March 1969 in France. Concorde was developed by both France and Britain. From 1956 these two countries had a _2__ of a supersonic passenger plane. In 1962 they started to __3__ together on the project. The plane __4_ over 1.5 billion pounds to develop. It is the most tested plane in the history. It was given over 5000 hours of testing. Concorde flies at twice the speed of _5__. This means that it _6_ only 3 hours 25 minutes to fly between London and New York, compare with 7—8 hours in other passenger jets. Because of the five-hour time difference between the USA and Britain, it is _7__ to travel west on Concorde and arrive in New York before you leave London! You can catch the 10:30a.m. _8__ from London, Heathrow and start work in New York an hour _9_! Concorde is much used by business people and film stars. Each Concorde is built at a cost of 55 million pounds. Twenty have been built so far. Air France and British Airway _10_ the most. They each have seven planes.
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生态系统是指在一定地域内，生物与环境所形成的统一整体．包括生物部分和非生物部分，生物部分包括植物、动物、细菌真菌等微生物，非生物部分包括阳光、空气、水、土壤、温度等．生态系统中的物质和能量是通过食...
