单项选择题

行进间双手传接球时，一般左（右）脚上前接球后，右（左）脚上步，左脚抬起在      出球。 A.
落地后；       B.
落地前；      C.
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3. What is the main difference between male and female gossip? A、Women don’t realize they are gossiping. B、Men only gossip outdoors. C、Women speak more about themselves than men do. D、Men speak more about themselves than women do.
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AT89C51单片机共有（）个外部中断源。 A. 1 B. 2 C. 3 D. 4
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