根据我国专利法规定，实用新型专利权的保护期限为（）。

A．否认了量变的必要性

B．否认了质变要以量变为前提

C．在实践中容易犯唯心主义的错误

D．容易导致“左”倾盲动主义的错误

［A］ there isn’t enough fund to support the research

［B］ cloning dogs is more complicated than cloning cats and bulls

［C］ Mr. Westhusin is too busy taking care of the business

［D］ the owner is asking for an exact copy of his pet

［A］ has long existed but changed its content ［B］ is often done with careful thinking

［C］ often leads to blaming and misunderstanding ［D］ is used to warn the child not to do it again