Part6 Practice on Passage 1.Listening Challenge Spot Dictation Directions: The following passage will be heard 3 times. During the second time, you are required to put the missing words or phrases in the numbered blanks according to what you hear. The third time is for you to check your answers. Now the passage begins. Vladimir Zworykin patented the idea, in May 1931, of projecting an image on a special plate which was 1) covered with a chemical photoemissive mosaic 2) consisting of granules of material, a pattern 3) comparable to the receptors of the human eye. Emission of photoelectrons from each granule in 4) proportion to the amount of light 5) resulted in a charge image being formed on the mosaic. Each granule, 6) together with the conductive plate behind the mosaic, formed a small capacitor, all of these having a common plate. An electron beam was then swept across the face of the plate from an electron gun, discharging the capacitors in 7) succession; the resulting changes in potential at the metal plate constituted the picture signal. 8)Unlike the image dissector the Zwory kin model was much more 9)sensitive, to about 75 000 lux. It was also easier to manufacture and produced a very clear 10)_image 202120P16 End2021/2/20 P.16 1.Listening Challenge Spot Dictation Directions: The following passage will be heard 3 times. During the second time, you are required to put the missing words or phrases in the numbered blanks according to what you hear. The third time is for you to check your answers. Now the passage begins. Vladimir Zworykin patented the idea, in May 1931, of projecting an image on a special plate which was 1) _________ with a chemical photoemissive mosaic 2) __________ of granules of material, a pattern 3) _____________ to the receptors of the human eye. Emission of photoelectrons from each granule in 4) ____________ to the amount of light 5) __________ in a charge image being formed on the mosaic. Each granule, 6) ___________ with the conductive plate behind the mosaic, formed a small capacitor, all of these having a common plate. An electron beam was then swept across the face of the plate from an electron gun, discharging the capacitors in 7) ______________; the resulting changes in potential at the metal plate constituted the picture signal. 8) ______ the image dissector the Zworykin model was much more 9) __________, to about 75 000 lux. It was also easier to manufacture and produced a very clear 10) ________. @ Part6 Practice on Passage End covered consisting comparable proportion resulted together succession Unlike sensitive image