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  3. Cyclo-cross is a cross-country bicycle racing in open and usually quite rough country with riders often forced to dismount and c

Cyclo-cross is a cross-country bicycle racing in open and usually quite rough country with riders often forced to dismount and c

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问题     Cyclo-cross is a cross-country bicycle racing in open and usually quite rough country with riders often forced to dismount and carry their bicycles.
    The sport, originated early in the 20th century in France, was prevalent in the 1920s, but became prominent in the 1950s (the British Cyclo-Cross Association was founded in 1954). An original European sport, cyclo-cross became popular throughout Western Europe and in the United States. World championships were initiated in 1925; by 1950 these were recognized by the Union Cyclist International(International Cyclists’ Union). After 1967 amateur and professional classes were officially separated in competition.
    The 24-kilometer cyclo-cross course, often involving taps, is usually completed in 60 minutes. A course typically includes obstacles such as ditches, mud, fallen trees, streams, flight of stairs, fences, and gates; artificial hurdles are added to insufficiently challenging natural courses. Cyclo-cross races are usually held from September to March, adding winter weather hazards to the challenge.
    There is a massed start with the field assembling not more than two abreast. Helpers are often stationed around the course with spare bicycles in case the original machine encounters mechanical difficulties or becomes too weighted down by mud picked up to the course.
Cyclo-cross became widely known______.
选项 A、in the 1920s
B、in the 1950s
C、in 1925
D、in 1967
答案B
解析 细节题。第二段第一句最后，直到20世纪50年代，越野自行车赛才为人们熟知(became prominent)。
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