The World Memory Champion（冠军）, Alex Mullen, can remember the order of a deck of cards in 17 seconds. But in some ways, he’s just as _______ as the rest of us. “I still forget plenty of basic things, like where I left my keys, ” said Mullen.

Memory athletes such as Mullen can remember hundreds of words and numbers and that seems unbelievable to us. But according to a study, _______ can train their brain using the same tricks as these men.

For the study, researchers recruited（招募）23 well-known memory athletes and _______ their brains with those of people who had never practiced memory skills. Then, they put the newcomers through a memory training _______ and found that the more the newcomers practiced the skills, the more they can remember things just like the memory athletes.

“These unbelievable memory abilities are not _______ talent. It’s really just training, ” said Martin Dresler, leader of the study.

Boris Nikolai Konrad, a researcher in Dresler's lab and a memory athlete himself, once _______ to find a larger memory center in memory athletics. But instead, their brains looked no different from the beginners’.

“It surprised me that we didn’t find structural（结构上的）_______ in the brain, ” said Konrad. His hypothesis（假设）_______ studies of London taxi drivers, who must remember thousands of streets for a very difficult test called-The Knowledge. Their brains were found to have larger memory centers.

_______ the brain structures of memory athletes were no different from the beginners’, Konrad said, there was something different about the way their brains worked: Their memory centers were communicating ________ with the visual（视觉的）and spatial（空间的）centers. And that may be the secret.

Bee and Butterfly live in Apple City on Fruit Island. There are five train lines on this island. Below is a map in the Apple Station. The number inside each station circle（圆圈）is the ticket price from the Apple Station to that station.