15.
B。
根据第一小节作者觉得这个时候去山里不合适,所以这里应选mountains。
102
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 __2__ France and Britain. From 1956 these two countries had
a 3__ of a supersonic(超声波)passenger plane. In 1962 they started to __4__
together on the project. The plane 5 over 1.5 billion pounds to
develop. It is the most tested plane in the history. It was given over 5,000
hours of testing. Concorde flies at twice the speed of 6 .
This means that it 7 only 3 hours 25 minutes to fly between
London and New York, compare with 7-8 hours in other passenger jets. Because __8__
the five-hour time difference between the USA and Britain, it is __9 to travel west on Concorde and arrive in New York before you leave
London! You can catch the 10:30am 10 from London, Heathrow and start
work in New York an hour 11 ! Concorde is much used by
business people and film stars. __12__ Concorde is built at a cost of 55
million pounds. Twenty have been built so __13__. Air France and British
Airway __14__ the most. They each __15__ seven planes.
1. A. invented B.
produced C.
flew D.
took off