题目

保护生物多样性是实现人类社会可持续发展的基础。下列对生物多样性的理解正确的是 Ａ．生物多样性的丰富程度与自然选择无关    Ｂ．群落演替过程中的生物多样性逐渐降低 Ｃ．物种多样性比较高的生态系统相对稳定    Ｄ．遗传多样性较低的种群适应环境能力弱 答案：D 解析: 略_______ cleaning the yard and making up the beds for the old, we also read newspapers for them and had chats with them.  A．Except forB．Rather thanC．Apart fromD．Instead of