根据汉语意思填单词。

l. Their _____ (梦想) have come true already.

2. _____ (跳水) is one of the most popular events at the Olympics.

3. He could speak English at the _____ (年龄) of five.

4. These books _____ (包括) English, Chinese and math.

5. She became the youngest Olympic _____ (冠军) at the 1992 Barcelona Olympics.

在气动系统中，空气过滤器、油雾器和（）被称为气动三联件，它是多数气动设备必不可少的气源装置。

A.换向阀

B.溢流阀

C.节流阀

D.减压阀