大学英语四六级阅读理解主旨题名师深解_大学英语阅读

大学英语四六级阅读理解主旨题名师深解

　　Step 3 The computer bring together the data from the input and the instructions from the storage. This is done by the computers control.

　　Step 4 The computer goes through the steps of the instructions on the data; this is called processing.

　　Step 5 The computer changes the result from electric language to human language. It presents the results in print or sound, called output.

　　Sometimes the five parts of a computer input, storage, control, processor , and outputare together in one large unit. Other times they are far apart and connected by wires. Often, large computers have one control and processing unit, with a number of separate memory, input, and output device.

　　What does the passage mainly tell us?

　　A The computer is an electric machine.

　　B Computer solve problems in the same way as people do

　　C How we add two numbers

　　D Computers have five parts together in one unit.

　　21 Astronomers have spent hundreds of years searching for signs of life on other planets, using telescopes. When they saw the geography of Mars , they thought they could see canals and that this might be evidence of intelligent life on the planet. More recently, however, spacecraft have been sent there to analyze the soil for signs of life. The result were negative and astronomers now feel certain that no life exist on the surface of any craft far beyond our solar system (太阳系)I not realistic because of the huge distances.