TOEFL Reading: ETS-TOEFL阅读机经 - S2ADUC0PY8YFUXS7L$

According to paragraph 3 the earliest stage of a secondary succession is characterized by each of the following EXCEPT A. an incomplete covering of vegetation B. a canopy made up of trees that vary widely in age C. relatively ample nutrients available in the soil D. relatively plentiful light reaching growing plants