Unlike most sports, which evolved over time from street games, basketball was designed by one man to(l)______ a particular purpo

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问题     Unlike most sports, which evolved over time from street games, basketball was designed by one man to(l)______ a particular purpose. The man was Dr. James Naismith, and his purpose was to invent a vigorous game that could be played(2)______ in the winter.
    In 1891, Naismith was an instructor at a training school, which trained physical education instructors for the YMCAs. That year the school was trying(3)______ up with a physical activity that the men could enjoy(4)______ the football and baseball seasons. None of the standard indoor activities (5)______ their interest for long. Naismith was asked to solve the problem by the school.
    He first tried to(6)______ some of the popular outdoor sports, but they were all too(7)______. The men were getting bruised from tackling each other and(8)______ hit with equipment. So, Naismith decided to invent a game(9)______ would incorporate the most common elements of outdoor team sports without having the real physical contact.
    Most popular sports used a ball. So he chose a soccer ball because it was soft and large enough that it(10)______ no equipment, such as a bat or a racket to hit it. Next he decided(11)______ an elevated goal, so that scoring would depend on skill and accuracy rather than on(12)______ only. His goals were two peach baskets,(13)______ to ten-foot-high balconies at(14)______ end of the gym. The basic(15)______ of the game was to throw the ball into the basket. Naismith wrote rules for the game,(16)______ of which, though with some small changes, are still(17)______ effect.
    Basketball was an immediate success. The students(18)______ it to their friends, and the new sport quickly(19)______ on. Today, basketball is one of the most popular games(20)______ the world.
(17)

选项 A、with
B、in
C、on
D、for

答案B

解析 be in effect为固定搭配,表示“有效,生效”。
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