【单选题】 短文 2 Our visual perception depends on the reception of energy reflecting or radiating from that which we wish to perceive. If our eyes could receive and measure infinitely delicate sense-data, we co...
A.
A mathematician can only solve problems the solution of which can be deduced from known axioms.
B.
An animal can respond to no command that is more complicated syntactically than any it has previously received.
C.
A viewer who has not learned, at least intuitively, the conventions of painting, cannot understand perspective in a drawing.
D.
A sensitized film will record no detail on a scale that is smaller than the grain of the film.
E.
A shadow cast on a screen by an opaque object will have a sharp edge only if the light source is small or very distant.
【简答题】 Passage Two: Today, ultrasonic( 超声的 ) waves are being put to work in laboratories and factories. If an ultrasound generator is placed in a liquid, the waves move the liquid back and forth hundreds o...