计算机总线在机内各部件之间传输信息，在同一时刻（24）。系统总线由三部分构成。它们是（25）。早期的微机，普遍采用ISA总线，它适合（26）位字长的数据处理。为了适应增加字长和扩大寻址空间的需要，出现了（27）总线，它与ISA总线兼容。目前在奔腾机上普遍使用，数据吞吐量可达2Gbps的局部总线是（28）总线。
27（）
Belle, our tiny monkey, was seated in her special chair inside a chamber at our Duke University lab. Her right hand grasped a joystick (操纵杆) as she watched a horizontal series of lights on a display panel. She knew that if a light suddenly shone and she moved the joystick left or right to correspond to its position, she would be sent a drop of fruit juice into her mouth.
Belle wore a cap glued to her head. Under it were four plastic connectors, which fed arrays of microwires—each wire finer than the finest sewing thread—into different regions of Belle’s motor cortex (脑皮层), the brain tissue that plans movements and sends instructions. Each of the 100 microwires lay beside a single motor neuron (神经元). When a neuron produced an electrical discharge, the adjacent microwire would capture the current and send it up through a small wiring bundle that ran from Belle’s c
A. grasped the joystick
B. moved the joystick to the side of the light
C. sat quietly in a special chair
D. watched lights on a display panel
Passage Three
In 1968, five people were murdered in Northern California. The killer called himself the Zodiac. He either shot or knifed his victims. No one knew when, where, or who the Zodiac would kill next.
Paul Stine is believed to have been his final victim. Stine was a cab driver in San Francisco when he was shot to death in 1969. The Zodiac sent a piece of Stine’s bloody shirt to a newspaper bragging about the killing.
The Zodiac has been compared with the recent Washington, D.C. snipers. These serial killers seemed to have no reason for the murders. Victims were chosen at random. Letters were sent to newspapers. In the letters, the killers made fun of the police who tried to catch them. Both the Zodiac and the D.C. sniper got thrills out of murdering and scaring people.
Arthur Allen was thought to be the Zodiac. The police never charged him. He denied that he had done the murders. When Allen died in 1992, tests were done on his
A. private investigator
B. San Francisco taxi driver
C. prime suspect
D. newspaper reporter
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