气焊和气割工作场所局部通风的特点包括（）
A.所需风量小
B.烟气影响工人
C.影响周围环境
D.通风效果不好
参考答案：A
The ________boy is playing chess with his grandfather.
A．8-years-old
B．8 years old
C．8-year-old
D．8 year old
节奏：
