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, scientists failed to______

选项 A、discover the characteristic of nuclear process
B、discover the nature of uranium ore
C、save the life of uranium miners
D、store nuclear wastes in underwater tanks

答案B

解析 第二段第三句提到,铀矿的放射性作用会导致死亡,但在很长时间人们没有发现。
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