TOEFL Reading: ETS-TOEFL阅读机经 - 5Z_50594RQ3D21YZL$

According to paragraph 4 which of the following is a characteristic of old growth forests A. improved ability to withstand major disturbances B. increasing amounts of woody debris C. a decline in the mortality rate of tree species D. increasing reliance on leaf and fine root deatritus as a source of nutrients