下列说法都正确的是 [ ] ① 江河入海口三角洲的形成通常与胶体的性质有关 ② 四川灾区重建使用了大量钢材,钢材是合金 ③ “钡餐”中使用的硫酸钡是弱电解质 ④ 太阳能电池板中的硅在元素周期表中处于金属与非金属的交界位置 ⑤ 常用的自来水消毒剂有氯气和二氧化氯,两者都含有极性键 ⑥ 水陆两用公共汽车中,用于密封的橡胶材料是高分子化合物
【简答题】Paraphrase: 1. The burying-ground is merely a huge waste of hummocky earth, like a derelict building-lot. (para 2) 2. All colonial empires are in reality founded upon that fact. (para 3) 3. They rise ...
【简答题】完形填空。 Lightning flashed through the darkness over Sibson's bedroom skylight (天窗). Sibson was shaken by a clap of thunder _1 _ he knew what was happening. The storm had moved directly _ 2 _ his two-sto...
【简答题】完形填空。 Thousands of years ago, people did not know 1 to make a fire. When it was very 2 at night, they could not sleep well. Sometimes lightning hit (打, 击) a 3 and started a fire. At first people were ...