It is implied in the passage that the primary difficulty in seeking a safe way to dispose of nuclear wastes is caused by______

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问题 It is implied in the passage that the primary difficulty in seeking a safe way to dispose of nuclear wastes is caused by______
According to the passage, uranium ore is very dangerous because______

选项 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

答案C

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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