A.poisonous gases.

　　B.air pollution.

　　C.water leakage.

　　D.radiation.

　　40 Scientists think that the decline of amphibians could

　　A.cause environmental change.

　　B.cause a decline in other kinds of animals.

　　C.be a warning signal for human beings.

　　D.be a good sign for human beings.

　　第三篇

　　Controlling Robots with the Mind

　　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 Belles motor cortex (脑皮层)， tile 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 Belles cap to a box of electronics on a table next to the booth. The box， in turn， was linked to two computers， one next door and the other half a country away.

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