【单选题】【消耗次数：1】
What role does a teacher play in the following activity? The teacher gives students 2 minutes to skim a text, and when time is up, he asks students to stop and answer some questions.
①
Controller
②
Assessor
③
Organizer
④
Prompter
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①
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②
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【单选题】
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③
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②
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②
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