单项选择题

What is the author's attitude towards technological advances in sports field

A．Neutral.
B．Critical.
C．Subjective.
D．Enthusiastic.
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单项选择题
A dancer and a single's skater would not have the same skate because ______.
A．they have numerous different boots to choose
B．they can thus maximize their sports performance
C．safety should always be taken into account in sports
D．a single's skater's boot is padded while a dancer's is not
单项选择题
An attempt to improve the performance of athletes is the use of ______.
A．a graphite ball
B．an aluminum bat
C．a textile golf ball
D．a recumbent bicycle
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