生态系统靠自身的调节能力维持绝对的平衡.______. 发布时间:2017-05-03 11:19 │ 来源:www.tikuol.com 题型:解答题 问题: 生态系统靠自身的调节能力维持绝对的平衡.______.
题型:解答题 —Betty, you _____ on the phone.—Thank you.[ ]A. want B. are wanting C. are wanted D. have wanted 查看答案