在“粗盐的初步提纯”实验中，下列操作正确的是（　　）

阅读下文，完成小题。
邹忌讽齐王纳谏（节选）
①于是入朝见威王，曰：“臣诚知不如徐公美。臣之妻私臣，臣之妾畏臣，臣之客欲有求于臣，皆以美于徐公。今齐地方千里，百二十城。宫妇左右莫不私王，朝廷之臣莫不畏王，四境之内莫不有求于王：由此观之，王之蔽甚矣。”
②王曰：“善。”乃下令：“群臣吏民能面刺寡人之过者，受上赏；上书谏寡人者，受中赏；能谤讥于市朝，闻寡人之耳者，受下赏。”令初下，群臣进谏，门庭若市；数月之后，时时而间进；期年之后，虽欲言，无可进者。
③燕、赵、韩、魏闻之，皆朝于齐。此所谓战胜于朝廷。

一个盒子中有5个红球、7个白球、10个绿球，从中随意摸出l个球，则摸到____球的可能性最大。

增加：在缺词处加一个漏字符（∧），并在其下面写出该加的词。

删除：把多余的词用斜线（\）划掉。

修改：在错的词下划一横线，并在该词下面写出修改后的词。

注意： 1）每处错误及其修改均仅限一词；

2）只允许修改10处，多者（从第11处起）不计分。

    One day, I was doing my homework in the bedroom. All of sudden, the light went out, leaving me in totally darkness. My mother came in with a candle. When I light the candle, the bedroom was brightened at once. I looked at the candle and was lost in thoughts. It is very small, and it isn't worth many. But what it gives us are great. It brightens the way of many scientist; it brightens the desks of my teachers; it also brightens my mind. I think I should learn with the candle. Small as it is, but it tries its best to giving us light and heat.