单项选择题

It is not the "someday I’ll win the lottery" kind of daydream, but the kind that taps into the hidden part of your brain. That is the kind that comes out only in the still of the (67) These are the dreams that can overtake you. They can cause you to sweat at night. And even when they (68) as consciousness looms, they can (69) a spell on your day. People have speculated (70) dreams for thousands of years since we find (71) humans drew pictures on the walls of caves. Because dreams couldn’t be controlled, they were attributed (72) the gods. Shakespeare used dreams (73) a dramatic device. Remember the sleepwalking Lady Macbeth who rubbed her hands (74) in an effort to cleanse the blood from her hands. "Out!" she cried, "damned spot!" However, it wasn’t until Sigmund Freud who came up with what is now (75) of as a highly flawed theory that we know dreams represent latent (76) that analyzing dreams became an (77) area of study. Not much changed since Freud. Researchers are unlocking the (78) meaning of dreams. A century after Sigmund Freud (79) the field of dream analysis, scientists are only now decoding the biology of how we manufacture (80) . At the Sleep Neuroimaging Research Program at the University of Pittsburgh Medical Center, researcher Eric Nofzinger, delves (钻研) into the (81) of sleeping subjects using PET scans normally employed to (82) various kinds of cancers. By injecting subjects (83) mildly radioactive glucose (葡萄糖), he has traced the (84) of dreams to a primitive part of the brain that controls emotions. "That’s (85) so many dreams are emotional events," says Nofzinger, "where we’re running from danger or (86) an anxious situation.\