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单选题
Why does the author call lichens pioneers?
A
Because they developed so early in the history of the planet.
B
Because of their primitive structure.
C
Because they prepare soil for other plants.
D
Because they were the first plants to live in Antarctica.
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参考解析
解析：
细节题。题干中的关键词为pioneers，该词出现在第一段最后一句，该句中的伴随状语提到appearing in barren rocky areas and starting the formation of soil in which mosses, then ferns, and then other plants can take root （它们在贫瘠的多岩石地区生长，开始了土壤的形成，之后各种植物才得以据此生根），由于前一句指出（地衣是生长在南极洲的植物之一），可知选项C（它们是首先在南极洲生存的植物）符合文意。
细节题。题干中的关键词为pioneers，该词出现在第一段最后一句，该句中的伴随状语提到appearing in barren rocky areas and starting the formation of soil in which mosses, then ferns, and then other plants can take root （它们在贫瘠的多岩石地区生长，开始了土壤的形成，之后各种植物才得以据此生根），由于前一句指出（地衣是生长在南极洲的植物之一），可知选项C（它们是首先在南极洲生存的植物）符合文意。
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