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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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
Through the experiments by Alicia Melis and her colleagues, we can conclude that ______.
A．chimpanzees know how to unlock the door to an adjacent room
B．chimpanzees can manage to reach a food tray from behind bars
C．chimpanzees understand cooperation and the way to secure it
D．chimpanzees are skilled at pulling on both ends of the rope
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