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问答题
According to Dr. Malina, the decrease in physical activity amongst young Americans is mainly due to______.
According to Dr. Malina, the decrease in physical activity amongst young Americans is mainly due to______.
A．a lack of physical education
B．an unhealthy diet
C．a lack of opportunities for physical exercise
D．the fact there are more opportunities for them not to exercise
A.
A．a
B.an
C.a
D.the
A．a
B.an
C.a
D.the
