使用海伦灭火器灭火时应距离火源（）
A.6－10英尺
B.4－5米
C.1－2米
D.18英尺
参考答案：A
In his poetry, Whitman shows concern for () and the burgeoning life of cities.
A. the colonists
B. the capitalists
C. the whole hard-working people
D. the intellectuals
