单项选择题

Early fitness spas were intended mainly for______.

A．the promotion of aerobic exercise
B．endurance and muscular development
C．the improvement of women's figures
D．better performance in aerobic dancing
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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
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
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