______on ten years ofobservation and study, Professor Wang announces that everyone dreams everynight, whether they realize it or not.

下列句子中不存在词类活用现象的一项是

I sightof an empty seat at the back of the bus and went directly there.

He fell off his bike and hurt hisback._____, he will have to stay in hospital for a long time.

James is one of the basketball ________ in NBA.