单选题
According to the passage, uranium ore is very dangerous because______
A、
it produces radioactive substances after it is dug out
B、
it has caused deaths of many miners
C、
the mining of it produces dangerous by-products
D、
there is a problem in mining techniques
【正确答案】
C
【答案解析】
第二段第二句提到，在开采铀矿时会产生具有放射性物质的副产品。
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