He and the other researchers worked with a group of 160 people who were caffeine free.On the first day，all the subjects were shown pictures of everyday objects.They were asked to identify whether the pictures could be found inside the house or outdoors.Some of the subjects were then given a caffeine pill，the others were given a placebo—a pill containing an inactive thing.On the second day，all of the subjects were asked to look at more pictures.Some of the images were exactly like the ones they had seen 24 hours early.But other images were different.And the third group of pictures was similar to the first group but a little different.The participants had to decide whether the images they saw were the same or different from the ones on the first day.

　　Professor Yassa says their answers help to show the effects of caffeine on memory.He says those who took the caffeine pills had a ten to twelve percent increase in their ability，to remember the objects.The amount of caffeine the researchers used in the study was similar to one strong

　　cup of coffee.

　　Professor Yassa says pills with a little more caffeine also increased memory，but resulted in some participants appearing more nervous.

　　6．From the passage，we can learn that caffeine________.

　　A．can be found in every plant

　　B．can improve people’s health

　　C．is contained only in coffee

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