单项选择题

Recent studies have suggested that weight training______.

A．has become an essential part of people's life
B．may well affect the health of the trainees
C．will attract more people in the days to come
D．contributes to health improvement as well

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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 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