选择题:经验证明,要使一个国家或地区的生态环境比较优越,其森林覆盖率要达到( ) 题目分类:习题答案 题目类型:选择题 查看权限:VIP 题目内容: 经验证明,要使一个国家或地区的生态环境比较优越,其森林覆盖率要达到( )A.10%B.20%C.30%D.40% 参考答案:
对于一个稳定的森林或草原生态系统来说,其组成成分中,唯一可缺少的成分( ) 对于一个稳定的森林或草原生态系统来说,其组成成分中,唯一可缺少的成分( )A.生产者B.消费者C.分解者D.无机环境 分类:习题答案 题型:选择题 查看答案
we moved to the country so that the kids would have a garden ________to play. we moved to the country so that the kids would have a garden ________to play.A.with whichB.in whichC. 分类:习题答案 题型:选择题 查看答案
If their marketing team succeeds, they __ their profits by 20 percent. If their marketing team succeeds, they __ their profits by 20 percent.A.will increaseB.would be incre 分类:习题答案 题型:选择题 查看答案