单项选择题

Hot containers of nuclear wastes to be put in Antarctic region would______

A．remain above ice sheets
B．be safe to environment
C．be highly probable
D．remain under sea
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单项选择题
It is implied in the passage that the primary difficulty in seeking a safe way to dispose of nuclear wastes is caused by______
A．the nuclear process involving the danger of radioactivity at its every stage
B．fuel for nuclear reactors producing dangerous wastes
C．the weakness scientists have found in every previous methods
D．the nature of nuclear wastes together with their lengthy life span
单项选择题
According to the passage, scientists failed to______
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
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