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【单选题】
老师制作完成了一个带有动画效果的PowerPoint教案,他希望在课堂上可以按照自己讲课的节奏自动播放,最优的操作方法是()A.
为每张幻灯片设置特定的切换持续时间，并将演示文稿设置为自动播放
B.
在练习过程中，利用“排练计时”功能记录适合的幻灯片切换时间，然后播放即可
C.
根据讲课节奏，设置幻灯片中每一个对象的动画时间，以及每张幻灯片的自动换片时间
D.
将PowerPoint教案另存为视频文件
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举一反三
【单选题】A deadweight loss ________.
A.
is created when firms underproduce the good but not when they overproduce the good.
B.
is a loss to producers of the good but not a loss to consumers
C.
is a loss to consumers and a gain to producers
D.
is a loss to the entire society
【简答题】Darwin was convinced that the loss of these tastes was not only a loss of happiness, but might possibly be injurious to the intellect, and more probably to the moral character.
【简答题】(50) Darwin was convinced that the loss of these tastes was not only a loss of happiness, but might possibly be injurious to the intellect, and more probably to the moral character.此处译文为：
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