选词填空。

          抬       拉      拔      扛

①小白兔在公园里____萝卜。

②小猴子____玉米上山去。

③弟弟和妹妹在____水。

④老牛____着一辆车在慢慢走。

将下列活细胞置于30%的蔗糖溶液中，能发生质壁分离现象的是(   )

①向第一份溶液中加入 AgNO₃溶液有沉淀产生；

②向第二份溶液中加入足量NaOH溶液充分反应后，最终得到沉淀0.58g，同时收集到气体0.03mol（设气体全部从溶液中逸出）；

③向第三份溶液中加入足量BaCl₂溶液（盐酸酸化）充分反应后，得到沉淀6.99g．

由此可知，下列关于原溶液组成的正确结论是（   ）

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