气囊
参考答案：
鸟类的呼吸系统十分特化，有发达的气囊系统与肺气管相通连，使鸟类具有双重呼吸，还可避免内脏摩擦及起到冷却作用。鸟类的气囊一共有9个。
读短文，把正确的序号填在括号里。
A picture
Hello! I'm Tom. I have a picture. In the picture I can see a sheep in a white shirt, a dog in a red dress, a pig
in pink shorts, and a cat in yellow socks. They are playing on the farm. I like the picture.
1. How many animals do you see in the picture?
A. 3
B. 4
C. 5
D. 6
2. I can see _____________ in a red dress.
A. a sheep
B. a dog
C. a pig
D. a cat
3. I can see _____________ in a white shirt.
A. a pig
C. a sheep
4. What are they doing?
A. They are playing.
B. They are reading.
C. They are singing.
D. They are sitting.
5. Does Tom like the picture?
A. Yes, he does.
B. No, he doesn't.
C. No, he does.
D. Yes, he doesn't.
除二类居住建筑外，高层建筑的疏散走道和安全出口处应设( )。
A．火灾应急广播
B．灯光疏散指示标志
C．高温照明灯具
D．应急照明灯
