suggest the limited function of sensory observation

　　18. According to the passage, quanta with an extremely long wavelength cannot be used to give complete information about the physical world because they

　　exist independently of sense-data

　　are graduated only in inches

　　have an insignificant amount of energy

　　cannot, with present-day instruments, be isolated from quanta of shorter wavelength

　　provide an insufficiently precise means of measuring length and position

　　19. Which of the following describes a situation most analogous to the situation discussed in lines 9-13?

　　A mathematician can only solve problems the solution of which can be deduced from known axiom.

　　An animal can respond to no command that is more complicated syntactically than any it has previously received.

　　A viewer who has not learned, at least intuitively, the conventions of painting, cannot understand perspective in a drawing.

　　A sensitized film will record no detail on a scale that is smaller than the grain of the film.

　　A shadow cast on a screen by an opaque object will have sharp edge only if the light source is small or very distant.

　　20. The author uses the analogy of the child s drawing primarily in order to

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