The boys enjoy playing basketball many of the girls relax by playing ping-pong.
A. while
B. or
C. since
D. if
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(答案→)A. while
B. or
C. since
D. if
解析：考查连词。A. while然而；B. or或者；C. since自从；D. if如果。这里while表示对比，相当于whereas，译作“而”、“可是”。句意：男孩子喜欢打篮球，而许多女孩子通过打乒乓球放松。故A正确。