【单选题】【消耗次数：1】
What role does a teacher play in the following activity? When students are doing a group-work task, the teacher joins one or two groups for a short period of time.
①
Controller
②
Assessor
③
participant
④
Resource-provider.
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②
操作材料可以促进学前儿童智力的发展
③
操作材料可以培养学前儿童积极的情感及意志力
④
操作材料可以培养学前儿童适应社会的能力。
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材料的投放要有明确的主题并且紧扣具体活动目标。
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投放材料难度形成一定的层次。
③
投放材料的开放性。
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同种材料与多种材料的灵活运用。