46. What is the main idea of the passage?
(A) The positive and negative effects of online classes.
(B) An introduction to the online seating arrangement system.
(C) The stories about a powerful system to fight against diseases.
(D) An approach to virtual physical interactions between teachers and students.

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統計: A(236), B(50), C(47), D(59), E(0) #2697972

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