多项选择题

在讲解微课堂与录制微课件时，要求（）
A、麦克风拾音效果要好，环境保持绝对安静
B、熟悉微讲稿，脱稿讲解最好
C、充分发挥教师语言艺术的魅力
D、控制语气、语速和语调，表达流畅
E、设法通过声音营造形象感、节奏感、临场感和愉悦感，让学生愿意听

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单项选择题

25% of a sample of 300 professional golfers indicate that their parents did not play golf. Based on this sample, we estimate that the 25% figure holds for the parents of all professional golfers. This is an example of statistical inference. A. 对 B. 错