鉴定可溶性还原糖、蛋白质、脂肪、观察DNA和RNA在细胞中的分布所用实验材料较合理的一组是

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”.

汽车是我们十分熟悉的交通工具，也包含丰富的物理知识．

a汽车的喇叭声是通过____传到人耳的．

b汽车发电机是利用____原理制成的，汽车上的热机工作时提供动力的是____冲程．

c汽车晚上行驶时车内灯通常是关闭的，这样可以防止____（选填“车内”或“车外”）的景物平面镜成像而影响到司机对路况的观察．