①经分析某物质只含有一种元素，则该物质一定是单质；

②质子数相同，电子数也相同的粒子，不可能是一种分子和一种离子；

③碱性氧化物一定是金属氧化物；

④NO₂不是酸性氧化物、Na₂O₂不属于碱性氧化物；

⑤两种盐反应一定生成两种新盐．

按要求填空。

“趣”字按部首查字法先查____部，再查____画。能组成词语____。

在我国，人与人之间是平等的，这指的是（   ）

实现中华民族伟大复兴的最可靠保证是（   ）

完形填空

通读下面的短文，从A、B、C三个选项中，选出一个最佳选项填空,使短文意思通顺、结构完整。

      Are there aliens? In the movie Home there1. The Boov are aliens. But their enemies ruined their planet. 2the Boov have to find a new planet. They choose to go to 3and drive people away.

      Earth is a good place. The Boov are4there. They have a party to celebrate. But a Boov named Oh makes a big 5. He asks everyone to come to their party, including their enemies. Other Boov think Oh is 6 spy(间谍). Oh 7run away. He meets Tip, the last8on Earth. Tip is smart. The Boov can't catch her.

      Both Oh and Tip are on the run. They become friends and go on adventures. On the way, the9 change each other's world. And they get to understand the true meaning of “10”.