单项选择题

What the author discussed in the previous sections is most probably about ______.

A．various performance-improving drugs
B．the development of modern technology
C．innovative equipment in the sports field
D．technological influences on other people

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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.

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