18.
(A) How to choose a good Christmas tree.
(B) What to do when there is a fire in their home.
(C) How to keep fire away from the Christmas tree.
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統計: A(47), B(17), C(87), D(0), E(0) #3028430
統計: A(47), B(17), C(87), D(0), E(0) #3028430