题型分类：表格填写题

题干分析：选择满足图表分类的正确选项。

选项分析：

文章第一、四、七段有提及 Gradualism，文章第二、三段有提及 Punctuated equilibrium。

B选项属于Gradualism，对应第一段“Darwin’s original thesis, and the viewpoint supported by evolutionary gradualists, is that species change continuously but slowly and in small increments.”。

D选项属于Gradualism，对应第四段“The evolution of North American horses, which was once presented as a classic textbook example of gradual evolution…”。

G选项属于Gradualism，对应第七段“...conclude that environmental conditions were quite stable during the period he examined”。

A选项属于punctuated equilibrium，对应第二段“...the punctuated equilibrium hypothesis, which posits that species give rise to new species in relatively sudden bursts, without a lengthy transition period.”。

E选项属于punctuated equilibrium，对应第三段“Intermediate fossil forms, predicted by gradualism, are typically lacking.”

C选项与原文描述不符。第四段第一句说“The evolution of North American horses, which was once presented as a classic textbook example of gradual evolution, is now providing equally compelling evidence for punctuated equilibrium.”前后理论有变化。

F选项无中生有。文章最后一段“Slow, continuous change may be the norm during periods of environmental stability, while rapid evolution of new species occurs during periods of environmental stress.” 不同环境条件有不同的进化方式，没说不变。