You try to keep your eyes wide open while watching a basketball match or a marvelous firework show in case you might miss something exciting in just the blink of an eye. But in fact, humans blink about 15 times per minute on average. Have you ever missed anything because you blinked? Probably not. Why is that?According to a new study published in journal Current Biology in September, our brain has the ability to “skip” the temporary darkness that we see when we blink. It can keep visual information for a short period of time and then put it together to form a conclusive image without interruption.In order to understand how this works, a group of scientists at the German Primate Center and the University Medical Center Gottingen in Germany conducted an experiment.In the study, the participants were asked to look at patterns on a screen whose orientation(方 向)could be shown in different ways, such as horizontally( 水平的) or vertically( 垂直的).When one pattern was about to disappear and the next one was about to come, the participants had to indicate the direction that the next pattern would be oriented in.The researchers found that when the orientations of two patterns didn’t match, the medial prefrontal cortex(内侧前额叶皮层)--- the area in our brain which is responsible for visual memory---was activated. This same area showed less activity when two patterns were in the same direction.“The medial prefrontal cortex adjust current visual information with previously obtained information, and thus enables us to see the world with more stability, even when we briefly close our eyes to blink,” Caspar Schwiedrzik explained in Science Daily. He is the first author of the study and also a scientist at the German Primate Center.29. What ’s the author’s intention to write the first paragraph?A. To bring out the topic. B. To show the importance of blink.C. To show some interesting event in his life. D. To give suggestions on when we should blink.30. Why can’t we miss anything when blinking?A. Because the time of the blink of an eye is too short.B. Because our brain has the ability to “skip” the darkness.C. Because our eyes can keep information and put it together. D. Because the medial prefrontal cortex has a special function.31. The underlined word “activated” probably means ___. .A. be injured B. be useless C. start working D. start being noticed