羽毛球挑球技术击球时，发力要点在于手臂和手腕的紧急制动。
A. 对
B. 错
My best friend ____ is a teacher, lives in Beijing.
A. who
B. which
C. when
That is the apartment block ____ my cousin lives.
A. when
B. that
C. where
The concert hall, _____ opened last year, is very popular with locals.
A. which
B. where
C. whose
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