单选题 According to paragraph 3, some workers have been killed by harmful pollutants in that

A、 production could not be halted.
B、 they failed take safety measures.
C、 research was not pursued to a solution.
D、 safety equipment was not adequately provided.

【正确答案】 C

【答案解析】[注释] 细节理解题。本题问：根据第3段，为什么有些工人死于有害污染物?第3段倒数第2句写道：“至少17名工人死于氯乙烯，原因是25年来研究工作没有一追到底。”10余年来，工人接触到的氯乙烯浓度是道尔化学公司硬性规定的“安全极限”的10倍。故[C]“研究没有进行到问题解决”与原文相符。