In real life, robots are mainly used in factories. They do many different jobs. Usually these jobs are too   43  , difficult or boring for humans.
Robots also help disabled people and people who cannot look after   44  . For example, scientists are making a robot to help blind people. Now many of them have a dog to help them. The dog is called a guide dog. In the future, guide dogs might be robot dogs.
One robot dog is called Meldog. It has wheels. It usually “walks” in front of its owner. It is very clever. It knows the speed of its owner’s walk. Meldog talks to its owner by   45 . The owner wears a special belt. This belt   46   instructions to the owner from Meldog such as “Stop here”, “Turn left” and “Turn right”.
In the United States, another   47   of robot helps disabled workers. This robot, called Kilroy, helps disabled computer operators. The robot   48   the sound of its owner’s voice. It follows instructions such as “Turn the page” and “Make a cup of coffee”.
Robots are also used in American   49  . They can do simple jobs. For example, they shave (刮脸) patients and brush their teeth and take meals from the kitchen to patients’ rooms. It never gets lost   50   this robot has a map of the hospital in its computer memory.

A．interesting B．strange C．dangerous D．safe

A．others B．another C．them D．themselves

A．television B．radio C．loudspeaker D．mobile telephone

A．posts B．writes C．reads D．sends

A．type B．size C．set D．double

A．guesses B．thinks C．hears D．sees

A．cinema B．hospitals C．museum D．theatre

A．until B．before C．because D．whether