6. The paper boat ________ across the pond when there is a gentle breeze blowing. When the air is still, the
boat stops moving.
(A) curses
(B) floats
(C)grins
(D) spares
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統計: A(26), B(461), C(12), D(15), E(0) #1560006
統計: A(26), B(461), C(12), D(15), E(0) #1560006