5. To protect your head, when you ride a motorcycle, you must wear a ______ .
(A) beard
(B) helmet
(C) necklace
(D) tie
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統計: A(31), B(436), C(42), D(14), E(0) #2913846
統計: A(31), B(436), C(42), D(14), E(0) #2913846