In the first paragraph, the writer says thatthe nano-spider, is much thicker than a human hair, cannot be seen under a microscope, was invented by an individual scientist, is an extremely small machine, Why does the writer suggest nano-spiders can be classified as robots?, because they have the features of a robot, because they can walk, because they are built with computer chips, because they are microscopic devices, What does "this" refer to in I.30?, the number of steps DNA walkers can manage, the walking distance a DNA walker can do, the length of the DNA walker, the time each step takes for a DNA walker, What do we learn about nano-spider in the fifth paragraph?, They could protect our bodies from disease in the future, They are already being used to fight cancer, They have been used for various medical purposes in the past, They have not actually been invented yet, What does the writer say about arguments against the use of nanotechnology?, People are concerned that it is used to build computer parts, People are concerned that nano-products are not tested before they are sold, There are concerns about whether the industry has strict rules for safety, There are no concerns about nanotechnology in medicine, All in all, the writer presents nanobots as devices which, we should be afraid of, have already been in use for many years, may be very useful in the future, are mainly useful in industry
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