单项选择题

According to 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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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
It is implied in the passage that many jokes make fun of women shoppers by saying that______.
A．they do not know what they want when they go shopping
B．they are fond of wandering about clothes shops
C．they waste too much time in selecting new clothes
D．they do not take the prices into account in shopping for clothes
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