对于准备SAT考试的同学们来说，
After reading the passage, choose the answer to the question that most effectively improves the quality of writing in the passage or that makes the passage conform to the conventions of standard written English. Sometimes the question will include a "NO CHANGE" option. Choose that option if you think the best choice is to leave the relevant portion of the passage as it is.
The creation of today's animated films, frequently hailed for their lifelike artistry, relies heavily on mathematics. Aspiring animators would benefit from a strong background in math if they wish to create, for instance, the rounded shapes making up an old man's knobby knuckles or a young girl's bouncy hair. One of the algorithms now considered an industry standard repeatedly subdivides a polygon by splitting and averaging the midpoint of a line. Developed by Pixar Animation Studio's Tony DeRose, this algorithm eliminated the problem of discernible edges of polygons by replacing them with the seamlessly rounded curves of the parabolas that emerge as a result of the polygon subdivision process. Innovations such as DeRose's depend on an understanding of applied mathematics in areas such as geometry, linear algebra, trigonometry, and calculus.
Which choice most effectively sets up the information that follows in the paragraph?
(A) NO CHANGE
(B) Animators use algorithms, or sequences of mathematical steps,
(C) The animation industry has grown increasingly dependent on computer-generated imagery
(D) In fact, animators draw on a variety of skills, many of them in fields outside of a traditional understanding of art,
解释：
Choice B is the best answer because it most effectively sets up the information that follows in the paragraph. Providing a general introduction to algorithms helps to lead readers to the more specific information provided about DeRose's polygon subdivision algorithm.
正确答案是B。
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