A、18. B、50. C、2. D、63. D

A passenger train has slammed into a double-decker bus at a rail crossing in rural Argentina, killing eighteen people and leaving almost fifty injured. The train was traveling fiom the capital Buenos Aires to the South Atlantic beach resort of Mar del Plata (7) when the collision occurred before dawn on Sunday near Dolores, about 200 kilometers south of the capital.  (8) The bus was canwing 61 passengers and 2 dryers. One of the bus passengers said the bus had tried to beat the train to the crossing, despite the train sounding its horn repeatedly as it approached. The train’s drivers also told investigators that the crossing barriers were down when the bus unexpectedly tried to cross the tracks in front of the train.