①C＋O₂ $\underset{\_}{\underset{\_}{点燃}}$ CO₂②Fe₂O₃＋3H₂ $\underset{\_}{\underset{\_}{高温}}$ 2Fe＋3H₂O

③Fe₂O₃＋3CO $\underset{\_}{\underset{\_}{高温}}$ 2Fe＋3CO₂

④2Fe₂O₃＋3C $\underset{\_}{\underset{\_}{高温}}$ 4Fe＋3CO₂↑

⑤CO₂＋C $\underset{\_}{\underset{\_}{高温}}$ 2CO

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”.

人们常说，“狗不嫌家贫，子不嫌母丑”。其主要意思是说（   ）

4的平方根是（     ）

已知函数$f\left(x\right)=\frac{x^2+x+1}{x^2+1}$，若$f\left(a\right)=\frac{2}{3}$，则f（﹣a）=（　　）