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  3. A new kind of machine【21】to take the place of humans. These machines【22】do jobs that are too dangerous for humans.【23】, they are

A new kind of machine【21】to take the place of humans. These machines【22】do jobs that are too dangerous for humans.【23】, they are

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问题     A new kind of machine【21】to take the place of humans. These machines【22】do jobs that are too dangerous for humans.【23】, they are being developed to work in nuclear power centers, deep waters and outer space.
    This is how the new machines work. A machine【24】placed in an area far away from the person who controls it. The person wears a special hard bat with tiny television screens. The screens【25】the person see and hear exactly what the machine is【26】and hearing. This gives the person the feeling of being in the same place【27】the machine. The person controls the machine. The machine【28】the person’s movements exactly. If the person raises his right arm, the machine raises the right arm, too. This means an【29】worker can do a dangerous job while【30】in a safe place. For example, a person can direct the machine【31】a bomb【32】going near the bomb himself.
    The new machines are not exactly【33】robots. Robots are controlled by a computer. The new machines are controlled【34】a person. The new machines are called teleoperators. The nuclear power industry is especially interested in teleoperators. The machines could solve the problem of【35】radioactive materials.  
选项 A、is developing
B、has developed
C、develops
D、is being developed
答案D
解析
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