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课时规范训练(单独成册) 训练(二十一) Ⅰ.阅读理解(共两节) 第一节阅读下列短文，从每题所给的四个选项(A、B、C、D)中，选出最佳选项。 学习网An electric signal can trick a monkey’s brain into believing the animal’s finger has been touched. Touch something，and your brain knows.The hand sends signals to the brain to announce contact was made.But that feeling of touch may not require making actual contact，tests on monkeys now show.Zapping brain cells can fool the animal into thinking its finger has touched something. A person who has lost a limb or become paralyzed may need an artificial limb to complete everyday tasks.But such patients may not truly feel any objects they hold.The new findings point toward one day creating a sense of touch in those who use such artificial limbs.Psychologist Sliman Bensmaia of University of Chicago worked on the new tests.His team’s findings appeared on October 14 in the Proceedings of the National Academy of Sciences of the United States of America. The sense of touch is crucial to everyday tasks：People without it may have difficulty cracking an egg，lifting a cup or even turning a doorknob.That’s why restoring it is a major goal for designers of artificial limbs. In their new study，Bensmaia and his coworkers worked with rhesus monkeys (恒河猴)．The scientists implanted electrodes (电极)—small devices that can detect and relay an electrical signal—into the animals’ brains.The scientists used the electrode data to identify which neurons had become active.Then the scientists used the implanted electrodes to zap those same neurons.And the monkeys reacted as though their fingers had been touched.In fact，they hadn’t. | 
