Question

20．Film cameras and digital cameras work in a similar way．
Film cameras
After all，a film camera is basically a light-proof （不透光的） box．It has a lens （镜头） system to focus light onto the film at the back of the camera．
Let's suppose that we are outside on a beautiful summer day trying to take a picture of the family dog．We are using a film camera．We finally get the dog to lie still．You point the camera at him．What happens？Light goes into the camera lens and hits the shutter．In other words，nothing happens yet．Now let's say that the dog looks really cute and you decide to snap a picture．What happens？When you press the button，the shutter open for a very short period of time．A small amount of light passes through and hits the film at the back of the camera．This creates an upside-down and reversed （反向的）image on the film．
    When you finish the roll of the film，you can take it to the photo shop to develop it and you will have a great picture of your dog!
    Cameras come with different lens lengths．Why does it matter？Many small cameras have shorter focal lengths，which means that there is a small distance between the lens and the place where the light focuses at the back of the camera．This gives you a large view of the area you are taking a picture of．Lenses with a long focal length show a smaller area but allow you to focus on distant objects and make them bigger．They are often called telephoto lenses．A good example of a long focus lens is one that is used by sports photographers to get photos of football players as if they were standing right beside them．
Digital cameras
    In digital cameras，the light falls not on film but onto a sensor （传感器）called a CCD （Charge Coupled Device）．This digitally converts（转变） light and colour into a digital information or pixels （象素）．The CCD is the heart of any digital camera and usually the most expensive part----depending on how good it is．
67．Which of the following statements is TRUE？C
A．Both digital and film cameras focus light onto the film．
B．All cameras have a sensor．
C．Digital cameras and film cameras have something in common．．
D．Small cameras usually have longer focal lengths．
68．In the"Film cameras"part，you fail to take the picture of the dog becauseC．
A．light goes into the camera lens and hits the shutter
B．you haven't aimed the camera at the dog
C．the image of the dog is not created
D．the sensor fails to convert light and colour into a digital information
69．The main reason that sports photographers can get clear and big photos of players is thatD．
A．they use digital cameras                              
B．the lens of their cameras is excellent
C．their focus lenses are short                        
D．their focus lenses are long
70．Generally speaking，a digital camera's price isA．
A．closely related to the quality of the CCD
B．irrelevant to the quality of the CCD
C．closely related to the lens
D．irrelevant to the lens．

Answer 1

分析 本文主要讲述了传统的胶片相机与数码相机的工作原理是一致的及各自的特点．

解答 CCDA
67．C 根据文章第一句Film cameras and digital cameras work in a similar way．可知传统的胶片相机与数码相机的工作原理是一致的，故答案为C
68．C 根据We finally get the dog to lie still．You point the camera at him．What happens？Light goes into the camera lens and hits the shutter．In other words，nothing happens yet．可知，没有拍摄成功的原因是底片没有形成图象，故答案为C
69．D 根据A good example of a long focus lens is one that is used by sports photographers to get photos of football players as if they were standing right beside them．
可知，拍摄清晰是因为长焦距的原因，故答案为D
70．A 根据The CCD is the heart of any digital camera and usually the most expensive part----depending on how good it is．可知，数码相机的价格与CCD的价格有关，故答案为A

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