题目

In the Caucasus region of Russia, nearly 50 out of every 100,000 people live to celebrate their 100th birthday, and many don’t stop at 100! By comparison, in America only 3 people in 100, 000 reach 100．But these Russian old people aren’t alone．The Pakistanis, who live high in the Himalaya Mountains, and the Ecuadorians of the Andes Mountains seem to share the secret of long life, too． These people remain healthy in body and spirit despite the passage of time．While many older persons in industrial societies become weak and ill in their 60s and 70s, some Caucasians aged 100 to 140, � 下列叙述错误的是： [　　] A． 捕食关系对维持群落的稳定有重要作用 B． 群落中植物的种群越多，动物的种群也一定越多 C． 演替是原有物种的恢复 D． 物质循环发生在生物群落与无机环境之间