单选题 Employees in chemical factories are entitled to receive extra pay for doing hazardous work.
A. poisonous B. difficult C. dangerous D. harmful

【正确答案】 C
【答案解析】[解析] 题干中的hazardous意为“有危险的”。A项“有毒的”；B项“困难的”；C项“危险的”；D项“有害的”，只有C项与题干种划线单词意义相近。