单选题:_______ come into leaf or bloom is obviously a sign of spri 题目分类:英语 题目类型:单选题 查看权限:VIP 题目内容: _______ come into leaf or bloom is obviously a sign of spring. A.Trees B.The trees C.That trees D.What trees 参考答案: 答案解析:
一片农田弃耕后,依次被杂草、灌丛乃至森林替代的过程属于( ) 一片农田弃耕后,依次被杂草、灌丛乃至森林替代的过程属于( ) A.原生演替 B.次生演替 C.逆行演替 D.水生演替 分类:英语 题型:单选题 查看答案