目前愈演愈烈的淡水资源短缺、水体污染问题产生的主要原因是( )
细胞在0.25M蔗糖溶液中吸水达动态平衡时,如果将该细胞置于纯水中,细胞将会
The students all well ____ (prepare) for the coming exams, so they all believe that they can easily pass them.