问题
选择题
下列关于Fe（OH） 3胶体的说法中不正确的是
A．Fe（OH）3胶体与硅酸溶液混合将产生凝聚现象
B．Fe（OH）3胶体粒子在电场影响下将向阳极移动
C．液溶胶中Fe（OH）3胶体粒子不停地做布朗运动
D．光线通过Fe（OH）3胶体时会发生丁达尔现象
答案
答案：B
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下列关于Fe（OH） 3胶体的说法中不正确的是
A．Fe（OH）3胶体与硅酸溶液混合将产生凝聚现象
B．Fe（OH）3胶体粒子在电场影响下将向阳极移动
C．液溶胶中Fe（OH）3胶体粒子不停地做布朗运动
D．光线通过Fe（OH）3胶体时会发生丁达尔现象
答案：B
| 完形填空。 It was one of the hottest days of the dry season. We had not seen 1 _ for almost a month. The crops were dying. If it didn't rain soon, we would lose everything. At noon, when I was 2 making lunch, I saw my five-year-old son, Billy, 3 towards the. woods. Minutes later, he ran back and then 4 walked towards the woods. This action-walking carefully to the woods and running back to the house, went on for nearly an hour. Finally I couldn't take it any longer and decided to follow him. As I entered the woods, I saw the most 5 sight. Two large deer appeared in front of him, and a little deer 6 _ on the ground, clearly suffering from heat exhaustion (中暑) , was lifting its head to lap (舔) up the water cupped in my son's hands. When the water was gone, Billy ran back to the house. I 7 him back to a water tap. Billy turned it on and knelt (跪) there, letting the drops slowly fill up the "cup" formed by his hands, 8 he stood up, I was there in front of him. His eyes just filled with tears. "I'm not wasting _ 9 _, Mum," he said. "No, Billy. I am _10 of you!" All I can say is the rain that came later that day saved our farm, just as one little boy saved a dying deer. | ||||
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