题目内容：
What is a teacher trying to do when he/she asks the students to describe what they know about policemen before reading a story about them?
A.To review a passage
B.To make a comment
C.To provide a title
D.To build a schema
参考答案：
答案解析：
选择题：What is a teacher trying to do when he/she asks the students to describe what th
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