Observation is the basic method of scientific inquiry. Scientific observation can be made directly with the naked eye, with the help of magnifying glasses, microscopes and other instruments, as well as cameras, video recorders, video cameras and other tools, and sometimes measurement is needed. Scientific observation should have a clear purpose; Observation should be comprehensive, meticulous and realistic, and recorded in time; Planned and patient; Think positively and record in time; It is necessary to exchange views and discuss to make the observation more comprehensive and typical. In observation, we should pay attention to examining the observed object from many aspects, levels and angles, and we should not replace the whole with parts or the objective facts with subjectivity. We should also pay attention to grasping the essential characteristics of things and not be confused by superficial phenomena. It does not mean that the characteristics of observation are relatively direct, and generally it does not take a long time. Looking up information on the internet, going to the library to consult books and periodicals, and conducting a general survey are not observations.

So choose: C.