下列有关实验操作或实验事故的处理中正确的是 ____　 （填序号）．

A．使用分液漏斗前要检查是否漏水

B．蒸馏时，温度计水银球应放在液面以下

C．选用CCl₄或酒精作为萃取剂从碘水中萃取碘

D．分液操作时，下层液体从下端放出，上层液体从上口倒出

E．不慎将少量浓H₂SO₄溶液沾到皮肤上，要立即用大量稀NaOH溶液冲洗

F．蒸发NaCl溶液时，要用玻棒搅拌，防止液体局部过热引起飞溅

G．配制H₂SO₄溶液时，先在量筒中加一定体积水，再慢慢加入浓H₂SO₄，并不断搅拌．

    On a cold winter day, a fox ____  mother bear that he would teach her how to fish. As she____ to learn, he took her to a hole in the ice, and told her to put her tail down in the water. He told her to keep the tail there for____ .  Then____ she pulled the tail out of the water, she would find fish around the tail. The bear was foolish enough to believe____ the fox said. She sat for a long time with her tail in the water. She was ____ the fish. But when she____  to pull her tail lout of the water, she found that it was frozen in the ice. She asked the fox to pull her out. But he laughed to himself and ____ . so she called father bear to help her. Father bear came. He pulled hard and ____ got her out, but a part of her tail was in the ice. That is____ people find the bear’s tail so short.