单选题
{{B}}Passage 1{{/B}}

Ice dancing developed from ballroom dancing, particularly the waltz, and was very popular in the early 190Os. It requires well-disciplined, precise footwork; conformity with one another's steps; and a keen sense of timing and rhythm. Ice dancing differs from pairs skating in that ice dancers are restricted to lifts no higher than the man's shoulders, and there are no jumps. One skate must be on the ice at all times.
Ice dancing competitions consist of three principal parts: compulsories, original dance, and free dance. In Compulsories, partners must perform two dances selected by the ISU, for example, waltz, tango, or polka. Compulsories involve set patterns in which dancers perform and repeat steps at certain points around the arena (竞技场). Although the steps are predetermined, dancers are encouraged to interpret them for artistic charming. Each compulsory dance counts for 10 percent of a pair's final score.
The original dance, formerly known as the original set pattern dance, requires skaters to design their own routine to their choice of music, set to a speed and rhythm previously, announced by the ISU. It counts for 30 percent of the final score, and skaters receive marks for composition and presentation.
In the free dance, the partners perform a dance to music of their choice. They are given marks for presentation and style as well as for technical merit. This dance counts for 50 percent of the final score.

【正确答案】 D

【答案解析】从第一段和第二段的开头来看，发现第一段开头讲的是“Ice dancing”的起源，第二段的开头讲的是“Ice dancing”的分类，而这二段开头句都是段落中心句。后面三、四段是根据其分类来详细讨论各细节，所以，文章的题目可确定为“Ice dancing”。