A、Oil refinery. B、Linen textiles. C、Food products. D、Deepwater port. B前三项都与商品有关，而D)却与此无关，可先排除。短文中提到It…has long been known for it

Belfast is the capital of Northern Ireland and a major city in commerce and industry. It is one of the most important ship-building and repairing centres of the United Kingdom, and has long been known for its linen textiles. Its manufactures include aircraft, guided weapons, and tobacco and food products. A large petroleum refinery here is supplied by imported petroleum which is received at the city’s deep-water port. Other imports include grain, coal, chemicals and iron and steel. Among the chief exports are petroleum products, soap, food stuffs and textiles.
    In Belfast, there are the notable Ulster Museum and the Protestant Cathedral of Saint Anne. As an educational centre, the city is home to Queen’s University of Belfast and Belfast College of Technology.
    Although there’s evidence that people once settled in this place during the stone and bronze Ages, the founding of Belfast dates from 1177 when a Norman castle was erected. Edward Bruce destroyed the settlement in 1315, the year he became the Irish King. The city was taken by the English in the 16th century. In the late 17th century, French refugees arrived here and developed the linen industry. The harbor was improved in the late 18th century and ship-building was begun on a large scale. The city was made the capital of Northern Ireland in 1910. During World War II, Belfast was heavily damaged by German bombing raids. Beginning in 1969, the city was the scene of religious disorder involving civil rights agitation and increased violence.
Questions 19 to 22 are based on the passage you have just heard.
19. For what has Belfast long been famous?
20. Which of the following does Belfast chiefly export?
21. When was Belfast founded?
22. What happened in Belfast in the late 18th century?