Human beings are never satisfied. They have always wanted things to be easier, faster, more comfortable or more 【B1】______.Human

Human beings are never satisfied. They have always wanted things to be easier, faster, more comfortable or more(36)convenient. Human history is the history of inventions. Various as they are, inventions(37)weigh heavily in the progress of society and mankind. They serve as a ladder for(38)civilization as well as for the evolution of man.
    An invention is something totally (39)original, something that nobody else has thought of. It may be something (40)physical, like a new machine, or it may be a new way of doing something, like the(41)reorganization of production methods in a factory. The earliest inventions, like boats and weapons, were simple but effective ways of meeting basic need and were developed(42)independently by people in different parts of the world who needed to travel or to hunt. Modern inventions are more technical and more(43)specialized. If you come up with a totally new idea, the first thing to do is to register your invention at the Patent Office.(44)It will be given a special number, which acts as a guarantee against anyone else stealing your idea.
    Early this century, someone suggested that the Patent Office could be closed because everything had already been invented!(45)But today, with new technology bringing about new inventions all the time, the Patent Office is busier than ever.
    However, it seems that we are inventing more technology than we need.(46)Some experts have criticized that the driving force behind many new inventions is profit rather than necessity. Nevertheless, the flow of inventions continues.