You provide a text with different types of problems and the students have to underline words or text phrases you have asked for. The text and its task have to be set up in such a way that the students can separate relevant content from irrelevant content.
Choose Underline from the Pop-up Menu and type your desired text into the box. The words or phrases which should be recognized as the correct solution need to be marked with <u> and </u>. e.g.: Today the <u>sun</u> shines.
More information about this kind of question and didactical advices you find here.
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