While it is easy to
perceive
perceive
（觉察）when students are interested，bored or distracted，it is sometimes much harder to tell when students are troubled.

【答案】perceive

【解答】

【点评】

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发布：2024/5/27 14:0:0组卷：2引用：2难度：0.5

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While it is easy to perceiveperceive （觉察）when students are interested，bored or distracted，it is sometimes much harder to tell when students are troubled.