问题
选择题
You are supposed to read your article carefully and get it polished _____ you submit it. |
A. until B. when C. before D. after |
答案
答案:C
You are supposed to read your article carefully and get it polished _____ you submit it. |
A. until B. when C. before D. after |
答案:C
请你连接相关部分
A.树林能保持水土 | a.生物对环境的适应 |
B.竹节虫停息是模样像竹子 | b.生物对环境的影响 |
C.地衣能分化岩石表面,而分化的岩石为地衣提供了更好的生存条件 | c.生物与环境是一个相互统一的整体 |