Another technological advance which is still in the experimental stage is the robot, a real “mechanized hired hand”that will be able to move and, in some ways, think like a human being. Agricultural engineers believe that computer-aided robots will make shocking changes in farming before the end of the century. Unlike farmers of the present, farmers of the future will find that many day-to-day tasks will be done for them. Scientists are now developing robots that will be able to shear (修剪)sheep, drive tractors, and harvest fruit. Even complex jobs will be done by robots. For example, in order to milk their cows, farmers must first drive them into the barn, then connect them to the milking machines, watch the machines, and disconnect them when they are finished. In the future, this will all be done by robots. In addition, when the milking is completed, the robots will automatically check to make sure that the milk is pure. The complete change of the farm is far in the future, but engineers expect that some robots will be used before long.

　　1. Which sentence carried the main idea of the whole passage?

　　A. The first sentence of the third paragraph.

　　B. The first sentence of the second paragraph.

　　C. The first sentence of the first paragraph.　

　　D. The last sentence of the second paragraph.

　　2. According to the passage, computers can not help farmers decide______.　

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