托福阅读中的指代题是出镜率相当高的题型之一，此外，在非托福的各种考试中，学生也常常会遇到类似的指代题，所以掌握指代题的题型分类和解题技巧对考学来说都是非常重要技能。
例一：Panel painting, common in thirteenth-and fourteenth-century Europe, involved a painstaking, laborious process. Wooden planks were joined, covered with gesso to prepare the surface for painting, and then polished smooth with special tools. On this perfect surface, the artist would sketch a composition with chalk, refine it with inks, and then begin the deliberate process of applying thin layers of egg tempera paint (egg yolk in which pigments are suspended) with small brushes. The successive layering of these meticulously applied paints produced the final, translucent colors.
The word "it" in line 4 refers to
(A) chalk
(B) composition
(C) artist
(D) surface
例二：Other trends and inventions had also helped make it possible for Americans to vary their daily diets. Growing urban populations created demand that encouraged fruit and vegetable farmers to raise more produce. Railroad refrigerator cars enabled growers and meat packers to ship perishables great distances and to preserve them for longer periods. Thus, by the 1890's, northern city dwellers could enjoy southern and western strawberries, grapes, and tomatoes, previously available for a month at most, for up to six months of the year. In addition, increased use of iceboxes enabled families to store perishables. An easy means of producing ice commercially had been invented I the 1870's, and by 1900 the nation had more than two thousand commercial ice plants, most of which made home deliveries. The icebox became a fixture in most homes and remained so until the mechanized refrigerator replaced it in the 1920's and 1930's.
The word "them" in line 14 refers to
(A) refrigerator cars
(B) perishables
(C) growers
(D) distances
