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B. a teacher can not necessarily answer all the questions his students ask
C. those who have less knowledge have more questions
D. anyone who learns more has more questions
B. a teacher does not have so many questions as his student
C. a student knows more than his teacher
D. a teacher has more chances to face what he doesn't know
B. A Teacher and His Student.
C. There Is No Limit to Knowledge.
D. One Is Never Too Old to Learn.
B. any book
C. a newspaper of magazine
D. An encyclopedia (百科全书)
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