I have a good friend at home. Her name is Mimi. She is white and yellow. She is very cute. I play with her when(当……的时候) I have time. She likes fish very much. When she is behind (在……之后) the sofa or in her box, you can’t see her. When I sit on the sofa, she sits with me. In the evening I do my homework at my desk, and she is on the desk. At that time I put her down(放下). Then she sits next to me. Is she a good friend of mine?

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”.

营造鸟巢对鸟的生殖有什么作用？

将一定质量的NaC1和Na₂SO₄固体混合物完全溶于水后，加入一定质量分数的BaC1₂溶液208克，恰好完全反应，过滤，得到23.3克沉淀，经测定滤液中含氯元素的质量为21.3克(不考虑过滤过程中物质质量的损失)。计算：

(1)所加BaC1₂溶液的溶质质量分数。

(2)原固体混合物中Na₂SO₄的质量。

(3)原固体混合物中NaC1的质量。