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【单选题】“幻灯片切换”中，在效果框中有“慢速、中速、快速”三个选项，这是指（）。
A.
幻灯片切换速度
B.
幻灯片放映停留时间
C.
幻灯片放映时间
D.
幻灯片播放动画的时间
【单选题】In bringing up children, every parent watches eagerly the child’s acquisition (学会) of each new skill the first spoken words, the first independent steps, or the beginning of reading and writing. It is...
A.
3) probably means" ______".A. ideaB. punishmentC. behaviourD. instruction