B．he didnt prepare enough food for the 42 students

C．he wanted two groups of participants, hungry and non-hungry

D．he didnt want to have the experiment at noon

38、 Why did the 80 words flash so fast and at so small a size on the screen?

A．To ensure the participant was unable to perceive anything.

B．To guarantee each word came out at the same speed and size.

C．To shorten the time of the experiment.

D．To make sure the participant had no time to think consciously.

39、 Radels experiment discovered that hungry people_______.

A．were more sensitive to food-related words than stomach-full people

B．were better at identifying neutral words

C．were always thinking of food-related words

D．saw every word more clearly than stomach-full people

40、 It can be learnt from what Radel says that_______.

A．humans thinking processes are independent of their senses

B．an experiment with hungry and non-hungry participants is not reliable

C．humans can perceive what they need without deep thinking processes

D．42 participants are too small a number for a serious investigation

41、回答41-55题

The Development of Ballet

　　Ballet is a dance form that has a long history. The fact that it survives to this day shows that it has adjusted as times have changed.

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